They tell us, sir, that we are weak; unable to cope with so formidable an adversary. But when shall we be stronger? Will it be the next week, or the next year? Will it be when we are totally disarmed, and when a British guard shall be stationed in every house? Shall we gather strength by irresolution and inaction? Shall we acquire the means of effectual resistance by lying supinely on our backs and hugging the delusive phantom of hope, until our enemies shall have bound us hand and foot? ~ Patrick Henry 1775
TriggerShims
CZ / Brno Rimfire Rifle
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~ Benjamin Franklin ~
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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
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"Better to be poor and honest than to be dishonest and rich." Proverbs 28:6
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American Made Gun Shims
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TriggerShims.com
CZ / Brno
~ Quick Links to Items on This Page ~
BRNO Bolt ShimsCZ 452 ~ 453 ~ 455 Bolt Shims
CZ 457 Bolt Shims
CZ BRNO Barrel Shims
TECH TIP: Bolt Shim Instructions ~ A General Guide
Field Tester TECH TIPS
TECH TIP PDF: CZ 457 Headspace
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
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~CZBarrel
CZ Barrel Shims
Barrel Shims for CZ / New for 2023
CZ and BRNO Rimfire Rifle Barrel Shims
CZ Models ~
Brno Models ~
New for 2023 CZ / Brno 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 NOT Bolt Shims
Bolt Shims Sold Below 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
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 Anywhere
Barrel Shims .710" X .850"
Item # SS-CZ/BarShim
Click Box to Choose Different Quantities
Includes Free Postage Anywhere
CZ 452 ~ 453 ~ 455
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
My Bolt Shims for the CZ / Brno Rifles fit these Models;
- CZ 452 ~ 453 ~ 455
- Brno 1 ~ 2 ~ 2E ~ 3 ~ 4 ~ 5
- Not for CZ 457 ~ Click Here for CZ 457
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
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 $$
TriggerShims Bolt Shims come in the following assortments, Buy Multiple Paks and Save $
NEW 5 Piece Kits ~ Include .0015" Shims for Finer Adjustment
- 4 Pak Assortment - $11 includes 1 each .002", .003", .004" and .005"
- 5 Pak Assortment - $14 includes 1 each .0015", .002", .003", .004" and .005"
- Use Drop-Down V and Buy 2X Double or 3X Triple Pak and Save $
- 2 Shim Pak - $7.50 *Specify your size in Box Below .0015" or .002" - .007"
- You can Request Your Own Assortment Thicknesses In Box Below
- Includes Free ~ First Class Mail Economy Shipping
Bolt Shims .610" X .690"
Item # SS-CZ/BS Bolt Shim Pak
Click Box to Choose Different Quantities
Includes Free Postage Anywhere
TriggerShims was asked by Gunsmith Jason Lowe ~ Lowey Products Australia to make shims for this bolt, and We Appreciate His Measurements, Photo's and Field Testing!
Link To: Kurt the Gunsmith ~ A Unique Look at the CZ-457 Action
Link To: Kurt the Gunsmith ~ CZ-457 Accuracy
CZ 457
Bolt Shims for CZ 457 Now In Stock
~ New Size for Better Fit ~
Guaranteed to Fit or Your Money Back
New Size is .376" X .565
New for 2022 CZ 457 Bolt Shims Now In Stock
Designed and Made Specifically By TriggerShims for the CZ 457 Rimfire Rifle
My Bolt Shims for the CZ Rifles fit these Models;
- CZ 457
These CZ Shims are .376" X .565"
CZ Bolt Shims sold in paks of 4 or 5 to check and adjust bolt to barrel fit
These are the Original TriggerShims Brand CZ Rifle Bolt Shims
A 4 Pak should adjust most any gun, Order multiple Paks for Multiple Guns and Save $$
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
Bolt Shims .376" X .565"
Item # SS-CZ457 Bolt Shim Pak
Click Box to Choose Different Quantities
Includes Free Postage Anywhere
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!
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 ~
Gunsmithing Journal
~ Gunsmithing Journal ~
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!
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
Bolt Shim Instructions
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
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
- Australian Lithgow LA 101
- Bergara B-14R Rimfire Bolt Shims
- CZ / BRNO Rimfire Bolt Shims
- CZ 457 Rimfire Bolt Shims
- Kimber 82G Target Rifle Bolt Shims
- Marlin 80 / 983 Rimfire Bolt Shims
- Mossberg 44 U.S. Bolt
- Mossberg 144 LSB Bolt
- Remington 40X Bolt Shims
- Remington 540X Bolt Shims
- Remington 504T Bolt Shims
- Ruger American Rimfire Bolt Shims
- Ruger 77/17 77/22 Bolt Shims
- Savage MKII Bolt Shims - Prototype
- Suhl 150 Rimfire Rifle
- Walther KK500 Rimfire Bolt Shims
- Winchester 52 Bolt Shims
- Winchester 75S Bolt Shims
- Tikka T1x and Sako P72 / M78 Rimfire Rifle
- Remington 513 T Rimfire Rifle ~ Now In Stock!
- Anschutz 54 ~ Now In Stock!
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
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.
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
BOX~BS01~9.11.22
Expanded Selection of Rimfire Rifle Bolt Shims for 2022
Links to Our Growing List of .22 Rifle Bolt Shims
- Australian Lithgow LA 101
- Bergara B-14R Rimfire Bolt Shims
- CZ / BRNO Rimfire Bolt Shims
- CZ 457 Rimfire Bolt Shims
- Kimber 82G Target Rifle Bolt Shims
- Marlin 80 / 983 Rimfire Bolt Shims
- Mossberg 44 U.S. Bolt
- Mossberg 144 LSB Bolt
- Remington 40X Bolt Shims
- Remington 540X Bolt Shims
- Remington 504T Bolt Shims
- Ruger American Rimfire Bolt Shims
- Ruger 77/17 77/22 Bolt Shims
- Savage MKII Bolt Shims - Prototype
- Suhl 150 Rimfire Rifle
- Walther KK500 Rimfire Bolt Shims
- Winchester 52 Bolt Shims
- Winchester 75S Bolt Shims
- 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
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
Have You Tried a Rim Gauge?
Link to Raven Eye Custom Rim Gauges
No country can be called free which is governed by an absolute power; and it matters not whether it be an absolute royal power or an absolute legislative power, as the consequences will be the same to the people. ~ Thomas Paine
