Tammy and I
Sincerely Appreciate Your Patronage
TriggerShims
Links Page
~ Proud to Fly the Flag of Liberty ~
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Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph ~ Thomas Paine
TriggerShims
CZ / Brno Rimfire Rifle
Rebellion Against Tyrants is Obedience to God
~ Benjamin Franklin ~
Manufacturer of
Trigger Shims Brand
American Made Gun Shims
- Home of -
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Since 2008
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We Manufacture the Widest Selection of Gun Shims to be Found Anywhere on the Planet
100% American Family Owned
Shively Sales - Manufacturer of
TriggerShims Brand™
Gun Shims
in
Michigan Center, Michigan
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God Bless the U.S.A.
American Made Gun Shims
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TriggerShims.com
PAGE INDEX
CZ / Brno
Shims and Parts
CZ Index
CZ Page Index
👉Link To: TriggerShims Brand Tee Shirts
~ Quick Links to Items on This Page ~
BRNO Bolt ShimsCZ 452 ~ 453 ~ 455 Bolt Shims
CZ 457 Bolt Shims
CZ 455 / 457 Barrel Shims
CZ 455 / 457 XL Barrel Shims
CZ 455 / 457 XXL Barrel Shims
CZ 457 Trigger Assembly Shims
CZ Extractor Spring
TECH TIP: Lance's Bolt Shim Instructions ~ A General Guide
Businesses We Recommend ~ CZ Links
Ammunition Testing at Whidden Gunworks
Field Tester TECH TIPS
TECH TIP: Kurt the Gunsmith Accurizing a CZ Rifle
- Important Headspacing Information -
TECH TIP PDF: CZ 457 Headspace by Jack Behrman
TECH TIP VIDEO: Test of Shims for CZ 457
TECH TIP VIDEO: Brno 4 Bolt Shim Installation and Results
TECH TIP VIDEO: How Long Will They Last?
TECH TIP VIDEO: CZ 452 CZ 455 Bolt Shims
TECH TIP VIDEO: CZ457 Head Space Adjustment
TECH TIP REVIEW: CZ 455 & Bolt Shims
TECH TIP REVIEW: CZ 457 FTE
TECH TIP VIDEO: CZ457 Bolt Disassembly and Reassembly
TECH TIP VIDEO: CZ455/452 Bolt Disassembly and Reassembly
New Here - May 2025
TECH TIP VIDEO: Shreckenguns: CZ 457: Measuring Headspace And Installing Bolt Shims
Customer Target Pictures
PAYMENT GUIDE AND INSTRUCTIONS
TECH TIP: Split or Deformed Shim
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
CZ 452 ~ 453 ~ 455
CZ / Brno Head Space Bolt Shim Kit
CZ / BRNO Rimfire Rifle Bolt Shims
CZ Models ~ 452 ~ 453 ~ 455
Brno 1 ~ 2 ~ 2E ~ 3 ~ 4 ~ 5
Also Fits:
Webley & Scott Xocet .22
Norinco JW25A and Variants
Diana R22 Classic or Carbon
New CZ / Brno Bolt Shims Now In Stock
My Bolt Shims for the CZ / Brno Rifles fit these Models;
- CZ 452 ~ 453 ~ 455
- Brno 1 ~ 2 ~ 2E ~ 3 ~ 4 ~ 5
- Also Fits ~ Webley & Scott Xocet Bolt Action Rimfire Rifle
- Norinco JW25A and Variants
- Not for CZ 457 ~ Click Here for CZ 457
These CZ Shims are .610" X .690" - Available in .002" to .007"
May Fit Other Models with a .604" to .609" X .705" Bolt
Known to fit Norinco CZ 452 Copies
CZ Bolt Shims sold in paks of 4 to check and adjust bolt to barrel fit
How does a Rimfire Bolt Shim work? The actual head space is in the recessed face of the bolt. Shimming between the two bolt halves ensures the bolt is up snug against the breech. If the bolt has excessive clearance at the breech it can to cause misfires and light strikes, or simply inconsistent accuracy. When a Production Rifle is assembled, a bit of extra room or excess tolerance can be left, and this slight variable can affect accuracy. When the bolt action rifle’s bolt locking surfaces become worn increases in the headspace can cause light firing pin strikes, poor ignition (misfires), looseness of the bolt, and loss of accuracy.
Proper Adjustment of the Bolt / Breech with Our Shims may Increase Accuracy
Factory fitting of the barrel into the receiver can also leave excess clearance between the bolt and breech.
Shims can also be used for adjusting after Re-Barreling.
If you are getting misfires and light strikes shimming the bolt may be a good way to solve it.
These are Our Original TriggerShims™ Brand CZ / Brno Rifle Bolt Shims Custom Made in Our Own Shop from American Made Stainless Steel - NOT Imported from Communist China
A 4 Pak or 5 Pak should do most any gun, Order multiple Paks for Multiple Guns and Save $$
Made from Tough, Long Lasting 304 Stainless Steel
Hi-Volume Shooters report that these shims can last 6,000 to 10,000 Rounds or More!
U.S.A. Made by TriggerShims
TriggerShims Bolt Shims come in the following assortments, Buy Multiple Paks and Save $
NEW 5 Piece Kits ~ Include .0015" Shims for Finer Adjustment
- 4 Pak Assortment - $11 includes 1 each .002", .003", .004" and .005"
- 5 Pak Assortment - $14 includes 1 each .0015", .002", .003", .004" and .005"
- Use Drop-Down V and Buy 2X Double or 3X Triple Pak and Save $
- 2 Shim Pak - $7.50 *Specify your size in Box Below .0015" or .002" - .005"
- You can Request Your Own Assortment Thicknesses In Box Below
- Includes Free ~ First Class Mail Economy Shipping ~ International add $1
Bolt Shims .610" X .690"
Item # SS-CZ/BS Bolt Shim Pak - CZ Models ~ 452 ~ 453 ~ 455
Click Box to Choose Different Quantities
Includes Free U.S. Postage
CHECK YOUR MODEL NUMBER - These are NOT for CZ457
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
👉Link To: INTERNATIONAL TERMS / POSTAGE
Lance, My 1981 BRNO No. 2 was scattering shots last week. I’m just back from the range where it liked your .003 shim well enough to put 11 hits in the red at 200 yds! That’s the second week in a row that your exciting contributions to our sport have shown extraordinary results! Thanks Again, Craig
TriggerShims was asked by Gunsmith Jason Lowe ~ Lowey Products Australia to make shims for this bolt, and We Appreciate His Measurements, Photo's and Field Testing!
Lance, I tried different shims and combinations of shims. I finally settled on .005". This gives me a slight open and close resistance. My group size shrunk to half the grouping I used to get. Not a benchrest grade group but a very respectable minute of squirrel.
Thanks for the CZ shims, Howard in the Great White North
Link To: Kurt the Gunsmith ~ A Unique Look at the CZ-457 Action
Link To: Kurt the Gunsmith ~ CZ-457 Accuracy
CZ 457 Bolt Shim Kit
CZ-457 Head Space Bolt Shim Kit
My Custom Bolt Shims are made to adjust the Headspace on your CZ-457 Rifle.
All Production (not "Custom Made") Rifles leave the factory with a large tolerance of Headspace to accommodate varying Rim Thicknesses by ammunition manufactures.
Most Bench Rest Shooters have a favorite ammunition, and by using my shims you can adjust your bolt headspace closer to your chosen ammunition, reducing variations in accuracy. I have complete installation suggestions on our TriggerShims.com Bolt Shims Page.
We have reports from many shooters who have proven that consistent headspace with our shims yield Consistently Improved Accuracy.
I Recommend Trying Our Shims with Your Favorite Target Ammo, Top Shooters Use Our Shims and Your Satisfaction is Guaranteed!
~ Used by Shooters World Wide ~
Satisfaction Guaranteed or Your Money Back!
Item # SS-CZ457 ~ .376" X .565
Our New CZ 457 Bolt Shims ALWAYS In Stock
Designed and Made in Michigan Specifically By TriggerShims Brand for the CZ 457 Rimfire Rifle
All of the instruction on my CZ Page that applies to the .22 LR Rimfire also applies to the .22 WMR and .17 HMR
My Bolt Shims for the CZ Rifles fit these Models;
- CZ 457 in .22 and .17 Rimfire Cartridge Calibers
These CZ Shims are .376" X .565"
CZ Bolt Shims sold in paks of 4 or 5 to check and adjust bolt to barrel fit
These are Our Original TriggerShims Brand™ CZ 457 Rifle Bolt Shims Custom Made in Our Own Shop from American Made Stainless Steel - NOT Imported from Communist China
A 4 Pak or 5 Pak should do most any gun, Order multiple Paks for Multiple Guns and Save $$
Made from Tough, Long Lasting American 304 Stainless Steel
👉TECH TIP VIDEO: CZ457 Bolt Disassembly and Reassembly
TriggerShims Bolt Shims come in the following assortments, Buy Multiple Paks and Save $
NEW 5 Piece Kits ~ Include .0015" Shims for Finer Adjustment
- 4 Pak Assortment - $11 includes 1 each .002", .003", .004" and .005"
- 5 Pak Assortment - $14 includes 1 each .0015", .002", .003", .004" and .005"
- Use Drop-Down V and Buy 2X Double or 3X Triple Pak and Save $
- 2 Shim Pak - $7.50 *Specify your size in Box Below .0015" or .002" - .007"
- You can Request Your Own Assortment Thicknesses In Box Below
- Includes Free ~ First Class Mail Economy Shipping ~ International add $1
Bolt Shims .376" X .565"
.22 LR ~ .22 WMR ~ .17 HMR
Item # SS-CZ457 Bolt Shim Pak
Click Boxs to Choose Different Quantities and Assortments
Includes Free U.S. Postage - International add Postage
NOTE: These are CZ 457 BOLT SHIMS
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
👉Link To: INTERNATIONAL TERMS / POSTAGE
Repeat Customer Rodolfo in WA Writes:
Lance, I do love supporting your business because of the quality of the product I’m getting. More power to you and Tammy. God Bless, Rodolfo
Mike from PA Writes:
Lance, just a note to share the joy :-)
your shims in my CZ 457 AT-ONE cut my groups (5 groups of 5 shots including cold bore shot) from 4 inch total of all five groups to 2.065 total of all five groups, almost in half. The CZ needed .007" of shims. It was little hard to open the bolt after firing so I backed down to 006, using a 004 and 002. Still shot a 7/16, a 5/16, a 3/8, a 7/16, a 5/8. Than I put 9 shots in 9/16 at 50 yds. I used to be sure of a 3/4 inch group, with an few 1/2 inch groups. I can't wait to see what I get at 100 yds and 150 yds ~ Thank you for your product!
Craig from NC Writes:
Lance, My new CZ 457 Jaguar with it’s 28” non-MTR barrel was shooting very respectably at 200yds but not quite up to the performance of my two MTR guns. I tried one of your .003" Bolt Shims but couldn’t close the bolt. But, the .002" shim created a new gun and shooting experience!! The very first outing yielded a 3/4 MOA group at 200 Yds all in a 2” bullseye square. Not bad for an 83 year old shooter.
From Adam in FL:
I would like to Thank You. The CZ 457 bolt shim kit produced SK Match results from the CCI Standard ammo I was using at 50 yards. I couldn’t be more pleased and you can be assured that I will spread the word in my circle!
Lance - Thanks for the shims. I was at the point this rifle was going for sale, it’s amazing what .006" worth of shims did for the accuracy. Thanks so much and great response and great parts. ~ Joel in Indiana
Hello Lance, Thank You for the quick service. I am in Sudbury Ontario and received my CZ Bolt Shims in 8 days. A great little product, who knew that something so minor would have such an effect on accuracy, my groups have shrunk by 1/3. I would definitely recommend these to others.
Thanks Again, Rick
BOX~CZBarrel
CZ Standard Barrel Shims
Barrel Shims for CZ / New for 2023
CZ Rimfire Rifle Barrel Shims - (NOT Bolt)
CZ Models ~ 455 / 457
Brno Models ~ ?
New for 2023 CZ Barrel Shims
Fits Models with a .707" + or - Barrel Shank
CZ Barrel Shims sold in paks of 3, 4 and 5 to check and adjust Barrel to Receiver fit
Generally Used for Long Shank Replacement Barrels
Will Fit Barrels with a .707" Shank and > .850" O.D. at Receiver
Barrel Shims are used to fit Custom Made Long Shank Barrels, and will move the barrel forward of the receiver.
These are Barrel Shims - These Are NOT Bolt Shims ~ (Bolt Shims are Sold ABOVE)
These are the Original TriggerShims Brand™ CZ / Barrel Shims Custom Made in Our Own Shop from American Made Stainless Steel - NOT Imported from Communist China
TriggerShims CZ Barrel Shims come in the following Assortment Paks;
- 5 Pak Assortment - $15.00 ~ Includes; .0015", .002", .003", .004" and .005"
- 4 Pak Assortment - $12.50 ~ Includes; .0015", .002", .003", .004"
- 3 Pak Assortment - $10.00 ~ Includes; .0015", .002", .003"
- 2 Shim Pak - $7.50 *Specify your size request in Box Below ~ .0015" or .002" - .005"
- You can Request Your Own Assortment Thicknesses In Box Below ~
Choose From .0015" or .002" - .005" - Includes Free ~ First Class Mail Economy Shipping ~ International Add $1
Barrel Shims .710" X .850"
Item # SS-CZ/BarShim
Click Box to Choose Different Quantities
Includes Free U.S. Postage
NOTE: These are Barrel Shims not Bolt Shims
NOTE: These are Barrel Shims not Bolt Shims
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
👉Link To: INTERNATIONAL TERMS / POSTAGE
Q: Barrel Shims or Bolt Shims?
A: Bolt Shims will move the Face of the BOLT FORWARD to the Barrel Breech,
Bolt Shims are for Tightening Headspace.
A: Barrel Shims will move the BARREL FORWARD away from the Bolt.
Barrel Shims are used if your Headspace is Too Tight, or if you are Replacing the Barrel with a Longer Shank Barrel
Lance, The barrel shims are a perfect fit on my 457 Varmint, both I.D. and OD. I'm happy with them. Thanks again, Bill
Lance, Got the 0.0015" Barrel Shim installed and it has fixed my stiff bolt and accuracy is on par with what it was before. Thanks Again! ~ Matt in MA
BOX~CZ/XLBarrel
CZ Xtra Large Barrel Shims
Barrel Shims for CZ Rimfire Rifles
CZ Rimfire Rifle Custom XL Barrel Shims - (NOT for Stock Barrels)
CZ Shank XL OD Barrels
Fits: Custom XL Barrels Over .900" O.D.
New for 2024 CZ XL Barrel Shims - .710" X .900"
Fits Models with a .707" + or - Barrel Shank
NOTE: These are XL OD Barrel Shims - NOT STOCK
CHECK YOUR SIZE BEFORE ORDERING!
Can also be used on Tika T1x with .700" Barrel Shank
Can also be used on Ruger RPR with .695" Barrel Shank
CZ Barrel Shims sold in paks of 3, 4 and 5 to check and adjust Barrel to Receiver fit
Generally Used for Custom XL Long Shank Replacement Barrels
Will Fit Barrels with a .707" Shank and > .900" O.D. at Receiver
Barrel Shims are used to fit Custom Made Long Shank Barrels, and will move the barrel forward of the receiver.
These Are NOT Bolt Shims
Bolt Shims will move the Face of the Bolt Forward to the Barrel Breech, Barrel Shims will move the Barrel FORWARD away from the Bolt.
Barrel Shims are used if your Bolt or Headspace is Too Tight, or you are Replacing the Barrel with a Long Shank
These are the Original TriggerShims Brand CZ / Barrel Shims Custom Made in Our Own Shop - NOT in Communist China
TriggerShims CZ XL Barrel Shims come in the following Assortment Paks;
- 5 Pak Assortment - $15.00 ~ Includes; .0015", .002", .003", .004" and .005"
- 4 Pak Assortment - $12.50 ~ Includes; .0015", .002", .003", .004"
- 3 Pak Assortment - $10.00 ~ Includes; .0015", .002", .003"
- 2 Shim Pak - $7.50 *Specify your size request in Box Below ~ .0015" or .002" - .005"
- You can Request Your Own Assortment Thicknesses In Box Below ~
Choose From .0015" or .002" - .005" - Includes Free ~ First Class Mail Economy Shipping U.S.
Barrel Shims .710" X .900"
Item # SS-CZ/XLBarShim
Click Box to Choose Different Quantities
Includes Free Postage U.S.
NOTE: These are XL Barrel Shims - Not Bolt Shims
NOTE: These are for Custom Made Barrels - NOT Stock
NOTE: These are CZ XL Barrel Shims not Bolt Shims
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
👉Link To: INTERNATIONAL TERMS / POSTAGE $2
BOX~CZ/XXLBarrel
CZ XXtra Large OD Barrel Shims
Barrel Shims for CZ / New for 2025
CZ Rimfire Rifle Custom XXL Barrel Shims - (NOT for Stock Barrels)
CZ XXL for 1" Outside Diameter Barrels
Fits: Custom XXL Barrels Over .975" O.D.
New for 2025 CZ XXL Barrel Shims - .710" X .975"
Fits Models with a .707" + or - Barrel Shank
NOTE: These are XXL for 1" and over O.D. Barrel Shims - NOT STOCK
CHECK YOUR SIZE BEFORE ORDERING!
Generally Used for Custom XXL Long Shank Replacement Barrels to Adjust Out Headspace
Will Fit Barrels with a .707" Shank and > .975" O.D. at Receiver
Barrel Shims are used to fit Custom Made Long Shank Barrels, and will move the barrel forward of the receiver.
These Are NOT Bolt Shims
Bolt Shims will move the Face of the Bolt Forward to the Barrel Breech, Barrel Shims will move the Barrel FORWARD away from the Bolt.
Barrel Shims are used if your Bolt or Headspace is Too Tight, or you are Replacing the Barrel with a Long Shank
These are the Original TriggerShims Brand CZ / Barrel Shims Custom Made in Our Own Shop - NOT in Communist China
TriggerShims CZ Barrel Shims come in the following Assortment Paks;
- 5 Pak Assortment - $15.00 ~ Includes; .0015", .002", .003", .004" and .005"
- 4 Pak Assortment - $12.50 ~ Includes; .0015", .002", .003", .004"
- 3 Pak Assortment - $10.00 ~ Includes; .0015", .002", .003"
- 2 Shim Pak - $7.50 *Specify your size request in Box Below ~ .0015" or .002" - .005"
- You can Request Your Own Assortment Thicknesses In Box Below ~
Choose From .0015" or .002" - .005" - Includes Free ~ First Class Mail Economy Shipping U.S.
Barrel Shims .710" X .975"
Item # SS-CZ/XXL710X975
Click Box to Choose Different Quantities
Includes Free Postage U.S.
NOTE: These are XXL Barrel Shims - Not Bolt Shims
NOTE: These are for Custom Made Barrels - NOT Stock
NOTE: These are CZ XXL Barrel Shims not Bolt Shims
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
👉Link To: INTERNATIONAL TERMS / POSTAGE $2
Item # CZ457 -T
CZ 457 Trigger Assembly Shims
Trigger Pin Shims for the CZ 457 Rifles
Shims Install on the Trigger Pin between the Trigger and Housing to Decrease Slack and Wobble in Trigger, Making Trigger Adjustments Crisper.
NOTE: Photo Shows Shim Outside Housing as Example of Placement
The Shim or Shims as needed will be placed inside housing between Trigger and Trigger Housing.
Trigger Shim (.120" X .251")
CZ 457 Trigger Standard Assortment List:
Our CZ Trigger Shim Pak Assortments BELOW are as follows;
2 Pak comes in .002"
4 Pak comes with 2 each .002" and .003"
6 Pak comes with 2 each .002", .003" and .004"
8 Pak comes with 2 each .002", .003", .004" and .005"
12 Pak comes with 4 each .002", .003", .004"
20 Pak comes with 4 each .002", .003". .004", .005" and .006"
24 Pak comes with 6 each .002", .003", .004" and .005"
30 Pak Gunsmith Special Assortment comes with 6 each .002", .003", .004", .005" and .006"
Choose ANY Trigger Pak and Specify Your Requested Thickness in Comment Box
Available in Stainless Steel ~ .002" - .006" Thickness
Our CZ Trigger Shims will Remove Side Play Found in Stock and Custom Trigger Assemblies, will Reduce or Stop the Trigger from Rubbing the Trigger Housing and Smooth the Trigger Pull, Center the Trigger on the Sear, Reduce Friction and Possibly Improve Accuracy.
Free Economy Shipping U.S. - First Class Mail
NOTE: These are TRIGGER ASSEMBLY SHIMS not Bolt Shims
👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION
Customer David from N.C. had done extensive work on his trigger and tested our TriggerShims Brand Trigger Assembly Shims writes:
Lance,
I was able to use just one shim in my CZ 457 MTR rifle, it took out what seemed like a lot of side play. The reward was I am now able to really really fine tune the trigger.
The shim allowed an incredible improvement as I guess getting rid of side play allowed better “control” of sear.
I am stunned at performance improvement ~ David in N.C.
If you would like to try e-clip trigger pins, I found they are available on EBay at JoJo's CZ 457 Aftermarket Parts ~ Click Photo Link Below ~ If you try them, let me know what you think :-)
Item# CZ Extractor Spring
CZ Extractor Spring
Now In Stock ~ Volquartsen Matching Extractor Clip Spring
Included in VF457EE Extractor Kit Above👆
$15 includes Free Shipping w/ Tracking - 2 for $25
Ships USA Only - NO EXPORTS
US Only - No Exports
~ VF457EE Extractor Reviews ~
Hi Lance, These CZ457 Volquarten parts work great! Since Volquartsen's extractor does not have half of the extractor hook and pusher end filed off they hold a cartridge securely without spitting it out as was an issue with my original CZ parts. My CZ extractor set dropped every empty case on top of my single shot magazine without ejecting it which made the single shot mag useless. This problem has been fixed by the Volquarten parts. Empty cases now extract and eject flawlessly. Some CZ owners might be concerned that since the bottom of the Volquarten hooks do not have a radius filed into them they might not allow cartridges to feed well out of the magazine but I have experienced no problems at all with feeding.
Bottom line: I really like the Volquartsen extractor set! ~ Jack
Hi Lance, Just wanted to tell you the CZ 455 extractors I purchased were finally installed in my CZ 455 with it’s 17 HMR barrel along with a .005 bolt shim to reduce the head space from .051 to .047. I went through 150 rounds of 17 HMR, three different manufacture (CCI, Hornady & Federal) with no problem, extracting every empty case as well as a few live rounds to see if they would extract, no problem.
Your idea along with Volquartsen Expertise make for a very good product, an extractor that works! ~ William in PA
Bolt Shim Instructions
Bolt Shim Instructions
LANCE'S TECH TIP:
Rimfire Bolt Shim Installation
~ A General Guide ~
Rimmed Cartridges use the thickness of the cartridge rim for head-spacing.
.22 Rimfire Cartridges Headspace on the Case Rim.
The Actual Headspace is in the Recessed Face of the Bolt.
You Must Make Sure this Recessed Bolt Face is Equal To or Deeper Than You Rim for Safety
Generally Speaking there is extra room left in production guns between the Bolt and Breech to accommodate a wide variety of ammunition with varying rim thicknesses
You should first measure the depth of your bolt face pocket to insure it meets SAAMI Headspace minimum depth.
Shimming between the two bolt halves ensures the bolt is seating the cartridge up gently against the breech with your chosen brand of ammunition.
You can use our color coded numbered shims like a gauge to find the when the bolt face touches the barrel breech face, and then calculate where you want to be with your bolt headspace depth and rim thickness measurements.
I cannot tell you which shim best works with your rifle, you decide that yourself by fitting and feel and
by shooting.
Installing Bolt Shims requires fitting by hand, and checking with the Bolt installed in the Rifle, and Locked Down -
you do not measure with the Bolt out of the Rifle.
To establish the Bolt/Breech fit, shims are installed and fitted on an empty chamber.
If possible it may give you a better feel if you leave the extractors off some rifles while fitting shims.
Start with a 4 or 5 Pak of shims, install the .0015" or .002" thinnest shim and see how your bolt closes,
if it seems to close as normal, then continue to install each thicker shim until the bolt starts to close harder than normal, stacking shims if necessary.
At the point where your bolt begins to close hard, that was the amount of slack that was in your bolt,
measured by whatever shim or shims combined were needed to bring the bolt up tight to the breech.
Now it is best to remove that shim, and step back one number, example would be if a .005" Red Shim causes the bolt handle to close harder than normal,
then take it out and install a .004" Purple Shim.
If you have to force or put undue stress on your bolt to close it, you should reduce the number of shims.
You will generally only use 1 of the 4 or 5 shims in the package, but you can stack shims together if needed.
When you have the correct shim installed, your bolt should close normally or just (ever-so) slightly tighter than normal.
If the bolt closes slightly tight, it is best to back up one step, remove .001"
Put a very small drop of oil on the shim.
Now you can go to the range and with the barrel pointed in a safe direction, once again check fit with your favorite ammo.
Due to variations in rim thickness, you may have to reduce the thickness of shims, remember you have already removed all the excess headspace from the bolt/breech,
so now the only thing to do is remove thickness (shims) if / as needed to get to your sweet spot or required headspace for the rim thickness of your favorite cartridge.
For Longest Shim Life use a drop of oil or a (very small amount of) grease on your shim.
If you have to force or put undue stress on your bolt to close it, you should reduce the number of shims.
A minimum of clearance should be maintained, while maintaining proper headspace. Do not put undue stress on the bolt by shimming too tightly as it is unnecessary!
At no time do you want to force the bolt to close, or to crush the rim, did I explain that clearly?
Forcing the Bolt to Close will put premature wear on the bolt shims and will not increase accuracy.
If you have any question, use a headspace gauge to check for proper headspace.
Bolt Shims have in many instances cured light strikes.
Will they help with Accuracy? Don't take my word for it,
Read our Customer Reviews or ask our Customers
Simply Chambering More Consistently Yields More Consistent Results.
Your Satisfaction is Guaranteed, if you feel you receive no benefit you may send your shims back for a Full Refund.
Copy and Paste This Link for Everything You Need To Know About Rimfire Headspace from Kurt the Gunsmith:
https://kurtthegunsmith.com/everything-you-need-to-know-about-headspace/
TriggerShims Bolt Shim Instructions Copyright 2025
V5/2025
Rimfire Rifle Bolt Shim Index
BoltShim-INDEX 9/24
Our Ever Expanding Selection of Rimfire Rifle Bolt Shims
Links to Our List of .22 Rifle Bolt and Barrel Shims
- Anschutz 54 ~ Now In Stock!
- Bergara B-14R Rimfire Bolt Shims
- CZ and BRNO Rimfire Bolt Shims
- CZ 457 Rimfire Bolt Shims
- Kimber 82G Target Rifle Bolt Shims
- Lithgow LA 101 and SA 2020 Rimfire
- Marlin 80 / 983 Rimfire Bolt Shims
- Mossberg 44 U.S. Bolt
- Mossberg 144 LSB Bolt
- Remington 5 Bolt Shims
- Remington 40X Bolt Shims
- Remington 504T Bolt Shims
- Remington 513T / 521T Rimfire Rifle
- Remington 540X Bolt Shims
- Ruger American Rimfire Bolt Shims
- Ruger 77/17 77/22 Bolt Shims
- Savage BMag Bolt Shims
- Savage MKII Bolt Shims - Prototype
- Springfield Armory Model 2020 Rimfire
- Suhl 150 Rimfire Rifle
- Tikka T1x and Sako P72 / M78 Rimfire Rifle / Walther KK300
- Walther KK500 Rimfire Bolt Shims
- Winchester 43 and 52 Bolt Shims
- Winchester 69 and 75 Bolt Shims
- CZ 455/457 Barrel Shims
- CZ 455/457 XL Barrel Shims
- 10/22 Barrel Shims
- 2500X and Trident Barrel Shims
- 3/4" Shank Bull Barrel Shims
~ Barrel Shims ~
NOTE: email me to be put on a list to Request a New Bolt Shim ~ Send Lance an Email ~
Unsolicited Testimonial:
Just a friendly note on the bolt shims I purchased and installed. My 5 shot group went from dime size at 50 yds to everyone touching and not being able to count individual holes.
Thank You for a Great Product ~ Riley in WV
Unsolicited Testimonial:
Lance,
I simply wanted to say thank you for providing Bolt Shims. My first one installed was on my Bergara B-14 22 Trainer. I won the club season matches in 2022. It's more accurate now than my winning season. After seeing an improvement, in an already accurate rifle, I've shimmed my Bergara Shooting Rimfire barreled action, two CZ 457, my 2020 Springfield, and my my 54 Annie. The Anschutz allowed for 5th place in the IR 50/50 factory class last year. I shimmed it yesterday. The common fliers were less frequent and overall consistency was improved. A noticeable improvement was seen in all the rifles.
Thanks again for offering a great product ~ Rob in NC
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BOX#CZ457~Headspace
TECH TIP PDF: Measuring Headspace on your CZ 457 Rifle by Jack Behrman
Measuring Headspace on your CZ 457 Rifle Jack Behrman ~ Click on Photo Link Right to Open PDF in a New Tab ~
If you would like to know how to measure your bolt action rim-fire rifle’s headspace without custom built gauges, this Tech Tip by Jack Behrman will show you how
The discussion of Rimfire Bolt / Breech Fit and the conclusions apply to all Rimfire Bolt Action Rifles although this article illustrates and explains this headspace measurement procedure on a CZ model 457
~ Click Photo Link to Open PDF in a New Tab ~
~ Click Here to Open Headspace PDF in a New Tab ~Gunsmithing Journal
~ Gunsmithing Journal ~
~ Important Headspacing Information ~
CZ-457 Accuracy:
The Most Affordable Way to Accurize Your CZ
An In-Depth Article in a Prominent Gunsmithing Journal about Bolt Shims
~ Click Photo to Open CZ-457 Accuracy in a New Tab ~
Quote from Kurt's Article ~ How Bolt Shims Work to Improve CZ-457 Accuracy
"It is no secret that headspace plays a huge role in rifle accuracy. On rimmed cartridges, such as the 17 HMR, .22 LR, and 22 Mag, the headspace is measured off the thickness of the cartridge rim. The tighter the headspace, the more consistent the cartridge will be positioned in the chamber, and the more consistent it will ignite the powder. Accuracy is a direct by-product of consistency and repeatability."
Lance, I received my shim pack in perfect condition. Well packaged and very fast shipping. They are hands-down the best shims I’ve ever used. Thank you for a great product at a fair price.
God Bless, Hank in NC
BOX#FRDidierCZ457
TECH VIDEO TIP: Test of Shims for CZ 457
An Sizable Test of Bolt Shims and Different Ammunition
Click on Photo Link Right for Didier in Paris Testing Bolt Shims for the CZ 457
The discussion of Rimfire Bolt / Breech Fit and the conclusions apply to all Rimfire Bolt Action Rifles
Painstakingly Testing many different types of Rimfire Ammo to find if there is any benefit to adding Bolt Shims ~ Didier in Paris France gives an in-depth description of the Rimfire Bolt and Shims, Carefully Tests and Records many different types of ammunition and presents the results
~ Click Photo Link to Open YouTube in a New Tab
~OR~ Click Here for Didiers YouTube Video in a New Tab- Test of shims for CZ 457
Please Subscribe and leave a comment and remember what your Mother taught you,
Son, if you cannot say something nice, don't say anything at all
Don't Forget to tell him Lance at TriggerShims.com Sent You!
Hello!
Thank you a lot, you make an amazing work for helping shooters like me! I've got a set of bolt shims and it's a game changer for my CZ! I've got one ELR competition in few month, wish me good luck !
God Bless You! ~ Flavien in France
Mr. Shively, I received my order today and had a chance to install the shim and test fire. I have never really been happy with the accuracy results from my CZ 457 MTR..... until now. I am amazed at what a difference such a simple adjustment makes.
I tried 3 shims and settled on the middle one. This rifle has gone from a mediocre shooter, with regular flyers, to a one hole tack driver. It is now in Anschutz territory. Thank you again for a great product! ~ Ralph
“A wise and frugal government, which shall leave men free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned — this is the sum of good government.” – Thomas Jefferson
Inrange Rimfire / Bolt Shim Insatallation
The Installation:
Brno 4 Bolt Shim
Also Applies to CZ Models ~ 452 ~ 453 ~ 455
TECH TIP VIDEO: CZ/Brno Bolt Shims Installation
This Tech-Tip Video by Dan at Inrange Rimfire shows installing
TriggerShims Brand™ Bolt Shims in a Brno Model 4
Very Clear Explanation that Applies to All Model Rimfire Bolts
The Results:
Brno 4 Bolt Shim Test at the Range
TECH TIP VIDEO: CZ/Brno Bolt Shim Results
This Tech-Tip Video by Dan at Inrange Rimfire shows the Results After installing
TriggerShims Brand™ Bolt Shims in a Brno Model 4
Very Clear Explanation that Applies to All Model Rimfire Bolts
.png "Click-to-Open Inrange Rimfire Video in New Window")
Rimfire Rifles Headspace on the Bolt Face, and different cartridges have different rim thicknesses, Try our TriggerShims Brand™ Bolt Shims and you may be able to improve your accuracy, and Your Satisfaction is Guaranteed!
Longevity
How Long will our Bolt Shim Last at the Range?
TECH TIP VIDEO: CZ/Brno Bolt Shim Longevity Results
This Tech-Tip Update Video by Dan at Inrange Rimfire shows the Results After Several Thousand Rounds in a Brno Model 4 ~ Click on Photo to Open Video in a New Window
I recently asked Dan how our shim was holding up for him and I was pleased to find he had 5 to 6 thousand rounds down range with one shim....
Dan at Inrange Rimfire wrote;
Your shims are gold man, period. They last, perform better than any other I have tried and are the cheapest mod out there that actually makes a difference. I finished 6th in Canada this season in competition and these shims make an absolute difference.
CZ457 Bolt Disassembly and Reassembly
TECH TIP VIDEO by Kurt the Gunsmith:
CZ457 .22 Bolt Disassembly and Reassembly
CZ455/452 Bolt Disassembly and Reassembly
TECH TIP VIDEO by Fieldsports Scotland:
CZ455/452 .22lr full bolt disassembly and reassembly
May 2025
CZ 457: Measuring Headspace And Installing Bolt Shims
TECH TIP VIDEO by Shreckenguns:
CZ 457: Measuring Headspace And Installing Bolt Shims
TECH TIP VIDEO by Dayattherange:
CZ452 CZ 455 and Lithgow LA101 with TriggerShims.com Bolt Shims
Customer TECH TIP VIDEO by Airgunner Bob_O:
CZ457 Head Space Adjustment Using Bolt Shims
TECH TIP REVIEW:
CZ 455 Varmint Tacticool with TriggerShims.com Bolt Shims
Lance, your shims are by-far the best bang for the buck in terms of accuracy improvement. I bought a CZ 455 Tacticool and it seemed to like SK Rifle Match but was still very inconsistent. Like most CZ owners, I started with a trigger spring, then bedding. Still no substantial improvement. I upgraded the trigger guard and tried varying baseplate torque values.
Again, no substantial gains. Then I read about your site at Rimfire Central and decided to give your product a try. I went to my local outdoor range, added the .004" shim while at the shooting table and loaded 5 rounds
My 50 yard groups shrunk from +1.5 MOA to sub 1/2 MOA! The enclosed (target) photo is result, the upper-left was the fouling group then it settled-in! Conditions were 3-7mph wind, 98% humidity, 78 degrees @50yds.
Your product is seriously underrated and unknown by most. I guarantee all of my future shooting conversations will include the impact your products have on accuracy.
Sincerely, Fernando in AL
TECH TIP REVIEW:
CZ 457 Failure To Extract
Lance, I’m happy to write a review on the shims that I received. I was having trouble with my CZ 457. It’s a custom build with a Bartlein barrel. It shoots lights out, but I couldn’t get it to shoot more than 60-70 rounds without having a failure to extract, followed by multiple per magazine. I called the builder, and they said to try new ammo. Well, I was already shooting Lapua Center X, and bought 5,000 rounds of it, so I wasn’t about to switch that easy. I have over 1,500 rounds through the gun and it still jams. Yesterday, lost an NRL22 match due to 3 FTEs in one stage that crushed my score. I was fed up with the rifle and ordered a new Proof barrel. On that same day, I received your shims. I found that I can fit a full .007 shims before the bolt was stiff. After I backed it down to the .005 shim, I took it to the range and was able to shoot 350 rounds without a single failure to extract! Definitely cancelling that new barrel! Your shims have saved me $600 and hours of work breaking in a new barrel. Thanks for the great simple product and the easy instructions. I will definitely recommend you to any others having this same problem. Chris in AZ
Customer Targets and Pictures
Customer IAN from New Zeland writes about his Ruger American® Rimfire Long-Range
Good Morning Lance and Tammy,
I have decided to write a small message to regarding my experiences with your shim kit.
I had purchased a Ruger American .22 Long Range and to say the accuracy was poor was an understatement. Nothing I did helped much.
I did the bedding, Action screw tension, the barrel crown, the trigger, one item at a time with extensive ammunition testing each time to find something it liked.
My CZ’s even with ammunition they didn’t like still outshot it.
Then I saw the Youtube video by Mr Revolver Guy from Day at the Range and thought ok, lets try the headspace and if that doesn’t work, I will sell it as it’s a dog.
I followed the easy instructions and straight away the groups tightened and also it started accepting ammunition it had sprayed around the targets before, every group tightened.
Like all 22LR it still has it’s preferences but all the groups are now touching at 50 yards.
My thanks to you both,
Regards Ian
D in Canada Sends His Before and After Targets
100 Yards with his CZ 452 American
Good Afternoon Mr. Shively, I just wanted to thank you for your excellent service and providing an equally excellent product. My shims arrived in short order and I was able to put them to the test. My groups shooting modestly priced ammo improved dramatically in my CZ 452 American, a rifle that I have been shooting with in Silhouette matches for over 14 years. It was up until now that I have been opting for more expensive Eley for matches, and with shortages in lots, finding difficulty with the 77 and 100 meter targets. I expect to see improvements in my scores and a better enjoyment of match days thanks to your product. Please accept my gratitude and Best Wishes to you and Tammy, D in Canada
I receive targets from happy customers weekly, and I like to display them as I get time, here is one of several from our new friend Stefano in Italy, who wrote that his rifle had lost accuracy after 25,000 rounds
CZ 457 Target from Italy
Hello Lance,
I finally managed to try the shims.
With 0.005” I found the precision of when the rifle was new (now has 25,000 rounds).
The rifle has returned to make groups of 5-7mm to 50 metres. Before it began to widen to 14-16mm.
Thank you so much for making this product. Best Regards, Stefano
10/22 Targets
Our Ruger 10/22 Trigger Shim Kits are used by Hunters and Competitive Shooters alike.
The difference made with our shims is a small part of an overall trigger job, but the difference can be as much as 1/2# Reduction in Pull Weight simply with shims.
One Important Key to Good Shooting is a Good Trigger!
Customer Rickey in North Carolina writes;
Lance, took my 10/22 with rebuilt trigger to the range today and ran 5 different ammos through it, see attached photos. The trigger job using your TriggerShims shims and the Wolff springs did wonders for shrinking my group sizes, .231” average for 5 different ammos ain’t bad, all groups are 5 shots at 50 yards. Thanks again for a great product/service!!! Rickey
If you would like to display your target, send an email to Lance@TriggerShims.com
Links to Businesses We Recommend:
Ammunition Testing at Whidden Gunworks
Links to CZ Barrel Manufacturers We Recommend:
EABCO for your CZ Barrel,
Trigger Parts and Accessory Needs
Newman Precision Rimfire Rifles
Check Out the Ultimatum Deuce 22LR Action
V-Dec/2024
CZ Damaged Bolt Shim
Question: My CZ 457 Bolt Shim is damaged or broken, why?
Answer: Hard to tell, very unusual to have a damaged shim in a 457
unless it is simply too tight, too much pressure is being applied to the shim, even the thinnest shim properly installed will last several thousand rounds.
Did you check the initial headspace? What was it?
What rim thickness are you using?
I wish I could help but without measuring the headspace and rims to know what amount we are dealing with, it's not even an educated guess.
I can tell you that it is very unusual with such a wide cross-section area shim, and it rarely happens in any shim I sell for any or all models.
We know from testing that a properly fitted thin shim like the CZ455 can last over 6,000 roulds
Have you looked for burrs, rough spots etc?
I sell thousands of these each year, but I only see this once in a great while,
usually from not measuring and using a shim making it too tight.
Not all guns can use bolt shims, it is possible that the gun is tight to begin with, or you are trying to compress the rim,
until you measure it one cannot know.
Shims are only to eliminate excess space, not put any pressure on the rim.
The best thing to do is read above Tech Tips and start from scratch;
If you have this problem and did not measure headspace, my guess would be too tight....
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2008 ~ 2025
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