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TriggerShims
CZ / Brno Rimfire Rifle

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We Manufacture the Widest Selection of Gun Shims to be Found Anywhere on the Planet

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Shively Sales - Manufacturer of
TriggerShims Brand
Gun Shims
in
Michigan Center, Michigan

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CZ / Brno

CZ Rimfire


The CZ ~ Brno hunting / varmint / target rifle
The CZ 452 also known as BRNO Model Two .22 Rifle is a series of magazine-fed bolt-action rimfire repeating rifles manufactured by the Czech firearms manufacturer Česká Zbrojovka Uherský Brod and imported into the United States by CZ-USA.


BOX~CZ

Bolt Shims for CZ / Brno Now In Stock


CZ / BRNO Rimfire Rifle Bolt Shims

CZ Models ~ 452 ~ 453 ~ 455

Brno 1 ~ 2 ~ 2E ~ 3 ~ 4 ~ 5

New for 2022 CZ / Brno Bolt Shims Now In Stock

CZ / Brno Rimfire Bolt Shims

My Bolt Shims for the CZ / Brno Rifles fit these Models;

These CZ Shims are .610" X .690"

May Fit Other Models with a .604" to .609" X .705" Bolt

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

CZ / Brno Rimfire 455 Bolt

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 the Original TriggerShims Brand CZ / Brno Rifle Bolt Shims
A 4 Pak should do most any gun, Order multiple Paks for Multiple Guns and Save $$

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

Bolt Shims .610" X .690"

Item # SS-CZ/BS Bolt Shim Pak

Click Box to Choose Different Quantities

CZ / Brno Bolt Shim Pak
Choose Assortment Shim Pak
Enter Choice / Request Below

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 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

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

BOX~CZ457

Bolt Shims for CZ 457 Now In Stock

CZ 457 Bolt Shims

CZ / Brno Rimfire Bolt Shims

~ New Size for Better Fit ~

Guaranteed to Fit or Your Money Back

New Size is .376" X .565

New for 2022 CZ 457 Bolt Shims Now In Stock
Designed and Made Specifically By TriggerShims for the CZ 457 Rimfire Rifle

CZ / Brno Rimfire Bolt Shims

My Bolt Shims for the CZ Rifles fit these Models;

  • CZ 457

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 the Original TriggerShims Brand CZ Rifle Bolt Shims
A 4 Pak should adjust most any gun, Order multiple Paks for Multiple Guns and Save $$

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
CZ 457 Rimfire Bolt Shims

Bolt Shims .376" X .565"

Item # SS-CZ457 Bolt Shim Pak

Click Box to Choose Different Quantities

CZ 457 Bolt Shim Pak
Choose Assortment Shim Pak
Enter Choice / Request Below

Customer 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 150yds ~ Thank you for your product!


Link To: Kurt the Gunsmith ~ A Unique Look at the CZ-457 Action

BOX#CZ457~Headspace

TECH TIP PDF: Measuring Headspace on your CZ 457 Rifle by Jack Behrman

TECH PDF TIP: CZ 457 Measuring Headspace

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 ~


BOX#FRDidierCZ457

TECH VIDEO TIP: Test of Shims for CZ 457

TECH VIDEO TIP: Test of Shims for CZ 457

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

Testing many different types of Rimfire Ammo to find if there is any benefit to adding Bolt Shims ~ Didier in Paris gives an in-depth description of the Rimfire Bolt and Shims, painstakingly 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!


Bolt Shim Instructions
TriggerShims Snek

TECH TIP: Rimfire Bolt Shim Installation
~ A General Guide ~

Rimmed Cartridges use the thickness of the cartridge rim for head-spacing .22 Rimfires Headspace on the Case Rim, and the actual head space is in the recessed face of the bolt.
Shimming between the two bolt halves ensures the bolt is up gently tight against the breech.
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. 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. 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.
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. 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.
For Longest Shim Life, once you have have correctly fitted your shims Top Canadian Shooter Dan Walker from Inrange Rimfire recommends using a heavy grease.
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, 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, did I explain that clearly?
Bolt Shims have in many instances cured light strikes. Will they help with Accuracy? Don't take my word for it, Read our the Customer Reviews or ask our Customers
Simply Chambering More Consistently, Yields More Consistent Results.
Your Satisfaction is Guaranteed, if you feel you got no benefit, you may send your shims back for a Full Refund.

TriggerShims Bolt Shim Instructions Copyright Oct/22



TriggerShims Snek

Rimfire Rifle Bolt Shim Index

BOX~BS-INDEX

Expanded Selection of Rimfire Rifle Bolt Shims for 2022

Links to Our Growing List of .22 Rifle Bolt Shims

  1. Australian Lithgow LA 101
  2. Bergara B-14R Rimfire Bolt Shims
  3. CZ / BRNO Rimfire Bolt Shims
  4. CZ 457 Rimfire Bolt Shims
  5. Kimber 82G Target Rifle Bolt Shims
  6. Marlin 80 / 983 Rimfire Bolt Shims
  7. Mossberg 44 U.S. Bolt
  8. Mossberg 144 LSB Bolt
  9. Remington 40X Bolt Shims
  10. Remington 540X Bolt Shims
  11. Remington 504T Bolt Shims
  12. Ruger American Rimfire Bolt Shims
  13. Ruger 77/17 77/22 Bolt Shims
  14. Savage MKII Bolt Shims - Prototype
  15. Suhl 150 Rimfire Rifle
  16. Walther KK500 Rimfire Bolt Shims
  17. Winchester 52 Bolt Shims
  18. Winchester 75S Bolt Shims
  19. Tikka T1x Rimfire Rifle
  20. Remington 513 T Rimfire Rifle coming Late November
  21. Anschutz 54 and 1907 - 1909 Rifles coming Late November
  22. NOTE: email me to be put on a list to be notified when new Bolt Shims are ready ~ Send Lance an Email ~





“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

The Installation:
Brno 4 Bolt Shim

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

Inrange Rimfire TriggerShims Logo

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

Inrange Rimfire TriggerShims Logo

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

Inrange Rimfire TriggerShims Logo

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.


TECH TIP VIDEO by Dayattherange:
CZ452 CZ 455 and Lithgow LA101 with TriggerShims.com Bolt Shims

TriggerShims Logo

Customer TECH TIP VIDEO by Airgunner Bob_O:
CZ457 Head Space Adjustment Using Bolt Shims

TriggerShims Logo

TECH TIP REVIEW:
CZ 455 Varmint Tacticool with TriggerShims.com Bolt Shims

CZ / Brno Rimfire Bolt Shim Target

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


BOX~BS01~9.11.22

Expanded Selection of Rimfire Rifle Bolt Shims for 2022

Links to Our Growing List of .22 Rifle Bolt Shims

  1. Australian Lithgow LA 101
  2. Bergara B-14R Rimfire Bolt Shims
  3. CZ / BRNO Rimfire Bolt Shims
  4. CZ 457 Rimfire Bolt Shims
  5. Kimber 82G Target Rifle Bolt Shims
  6. Marlin 80 / 983 Rimfire Bolt Shims
  7. Mossberg 44 U.S. Bolt
  8. Mossberg 144 LSB Bolt
  9. Remington 40X Bolt Shims
  10. Remington 540X Bolt Shims
  11. Remington 504T Bolt Shims
  12. Ruger American Rimfire Bolt Shims
  13. Ruger 77/17 77/22 Bolt Shims
  14. Savage MKII Bolt Shims - Prototype
  15. Suhl 150 Rimfire Rifle
  16. Walther KK500 Rimfire Bolt Shims
  17. Winchester 52 Bolt Shims
  18. Winchester 75S Bolt Shims
  19. Tikka T1x Rimfire Rifle

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 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


Andy in Oz TriggerShims Logo

Have You Tried a Rim Gauge?

Link to Raven Eye Custom Rim Gauges

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BOX~ESU

SHIMS ONLY
$4 UPGRADE from ECONOMY SHIPPING
~ USA ONLY ~

(Shims Only) Orders - Add USPS TRACKING $4 - USA ONLY

MOST Shim orders under $50 DO NOT include Tracking and are sent in a
White Business Mail Envelope - Orders OVER $50 Include Free Tracking
You can Upgrade to USPS Mail Tracking on your SHIM ORDER for $4.00
This Upgrade includes a 6X9 Bubble Pak Mailer and USPS Tracking
(increases have driven our cost for Shipping and Packaging to almost $5)
THIS IS FOR SHIMS ONLY - ALL OTHER ORDERS Include this Upgrade

~Click the ADD TO CART button below to ADD USPS Tracking to your Shim Order

Enter Special Notes Below


We Cheerfully accept Cash, Money Order, and Credit Cards through our Secure PayPal Check-Out

All Website Orders are Shipped the Next Business Day

I will Ship Shims to USA, Canada and International

Gun Parts Shipped to USA Only


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"American Made Gun Shims" - GunShims.com - TriggerShims.com
and
TriggerShims is a Trademark
of
Shively Sales
Michigan Center, Michigan

Copyright 2008 ~ 2022

God Bless and Make America Great Again!

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YOU ASSUME ALL RESPONSIBILITY FOR THEIR SAFE INSTALLATION AND USAGE.
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Lance at Webmaster@TriggerShims.com

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