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    Bolt Shim Page

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    Rebellion Against Tyrants is Obedience to God
    ~ Benjamin Franklin ~

    Manufacturer of
    Trigger Shims Brand
    American Made Gun Shims
    - Home of -

    Gun Shims
    Gun Smith Supplies
    Since 2008

    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
    Michigan Center, Michigan

    "Better to be poor and honest than to be dishonest and rich." Proverbs 28:6

    Contact Us

    ~ Send Lance an Email ~

    ~ Quick Links to Items on This Page ~

    Index for Bolt Shim on Our Website

    Index for Bolt Shim Sizes

    Bolt Shim Reviews - Under Construction

    Tech Tip: Rimfire Headspace

    Tech Tip: Anschutz 1712 w/ Targets

    I just wanted to say, that your bolt shims are just what the doctor ordered.
    It is not often that you find such a simple fix to anything, but these truly are.
    Thank You! Trent in UT

    Index for Bolt Shim on Our Website
    TriggerShims Snek

    Rimfire Rifle Bolt Shim Index


    Expanded Selection of Rimfire Rifle Bolt Shims for 2023

    Links to Our Growing List of .22 Rifle Bolt Shims

    1. Anschutz 54 ~ Now In Stock!
    2. Bergara B-14R Rimfire Bolt Shims
    3. CZ and BRNO Rimfire Bolt Shims
    4. CZ 457 Rimfire Bolt Shims
    5. Kimber 82G Target Rifle Bolt Shims
    6. Lithgow LA 101 and SA 2020 Rimfire
    7. Marlin 80 / 983 Rimfire Bolt Shims
    8. Mossberg 44 U.S. Bolt
    9. Mossberg 144 LSB Bolt
    10. Remington 40X Bolt Shims
    11. Remington 504T Bolt Shims
    12. Remington 513T / 521T Rimfire Rifle
    13. Remington 540X Bolt Shims
    14. Ruger American Rimfire Bolt Shims
    15. Ruger 77/17 77/22 Bolt Shims
    16. Savage BMag Bolt Shims
    17. Savage MKII Bolt Shims - Prototype
    18. Springfield Armory Model 2020 Rimfire
    19. Suhl 150 Rimfire Rifle
    20. Tikka T1x and Sako P72 / M78 Rimfire Rifle
    21. Walther KK500 Rimfire Bolt Shims
    22. Winchester 43 and 52 Bolt Shims
    23. Winchester 69 and 75 Bolt Shims
    24. New for 2023
      ~ Barrel Shims ~

    25. CZ 455/457 Barrel Shims
    26. 10/22 Barrel Shims
    27. 2500X and Trident Barrel Shims
    28. NOTE: email me to be put on a list to be notified when new Bolt Shims are ready ~ Send Lance an Email ~

    Index for Bolt Shim Sizes

    Selection of Rimfire Rifle Bolt Shims Sorted by Size

    Bolt Shims Sorted by I.D. Size

    1. .357 x .595 Remington 540X Bolt
    2. .376 x .500 Ruger American Rimfire Rifle Bolt Shims
    3. .376 x .565 CZ 457 Rimfire Bolt
    4. .442 x .595 Mossberg 44 U.S. Bolt and H&R M12
    5. .442 x .648 Ruger 77/22 Bolt
    6. .450 x .565 Winchester 69A / 75S Bolt
    7. .450 x .595 Marlin 983 Bolt & Remington 504T
    8. .480 x .570 Remington 513
    9. .480 x .610 Mossberg 144 LSB
    10. .480 x .648 Savage MKII Bolt
    11. .480 x .751 Walther KK500 Bolt Shim
    12. .500 x .610 Kimber 82 U.S. Bolt
    13. .500 x .648 Bergara B14-R Bolt
    14. .511 x .648 Winchester 52 / Suhl 150 Bolt
    15. .532 x .640 Anschutz 54
    16. .555 x .670 Tikka T1x
    17. .570 x .690 Remington 40X Bolt
    18. .595 x .690 Lithgow LA101 Bolt / SA 2020 Rimfire
    19. .610 x .690 CZ / BRNO Bolt ~ Also Fits: Webley & Scott Xocet
    20. .710 x .850 CZ Barrel Shim

    Bolt Shims Sorted by O.D. Size

    1. .376 x .500 Ruger American Rimfire Rifle Bolt Shims
    2. .376 x .565 CZ 457 Rimfire Bolt
    3. .450 x .565 Winchester 69A / 75S Bolt
    4. .480 x .570 Remington 513
    5. .357 x .595 Remington 540X Bolt
    6. .442 x .595 Mossberg 44 U.S. Bolt and H&R M12
    7. .450 x .595 Marlin 983 Bolt & Remington 504T
    8. .500 x .610 Kimber 82 U.S. Bolt
    9. .480 x .610 Mossberg 144 LSB
    10. .532 x .640 Anschutz 54
    11. .442 x .648 Ruger 77/22 Bolt
    12. .480 x .648 Savage MKII Bolt
    13. .500 x .648 Bergara B14-R Bolt
    14. .511 x .648 Winchester 52 / Suhl 150 Bolt
    15. .555 x .670 Tikka T1x
    16. .570 x .690 Remington 40X Bolt
    17. .595 x .690 Lithgow LA101 Bolt
    18. .610 x .690 CZ / BRNO Bolt ~ Also Fits: Webley & Scott Xocet
    19. .480 x .751 Walther KK500 Bolt Shim
    20. .710 x .850 CZ Barrel Shim


    Hi Lance, Just wanted to let you know that I received the bolt shims, installed them, and am very happy with the accuracy improvement. I changed the barrel on my 457 from 22 lr to 22 mag, and it shot well with several brands of ammo. However, I need to hunt with lead-free ammo around here, and the only kind I can get is Winchester Varmint LF. I was shooting groups around 2 MOA, and had quite a few misfires. My groups tightened to about half that with the shims, and I also cut way down on misfires. Thanks! James in CA

    v.4t Item # VF457EE
    TriggerShims Logo CZ 457 Extractor

    ~ NEW ~
    CZ 457 Extractors

    CZ 457 Exact Edge Extractor by Volquartsen

    Fits Models CZ 452/453/455/457

    ~ Limited First Run Quantities ~

    In Stock ~ Order Now! ~ Ships Next Day M-F -
    High Quality Replacement CZ Extractors by Volquartsen

    CZ 457 Extractor

    Wire EDM Manufactured to Exacting Tolerances from Hardened A2 Tool Steel

    • 1 Extractor
    • 1 Holder
    • NOTE: Extractor Spring Not Included

    Fits: Models CZ 452/453/455/457

    Fits: Right Hand Models

    6/27/23 Update: I have asked the factory in Czechoslovakia specifically - Are the Extractor, Holder, and Spring the same across the CZ models CZ 452/453/455/457
    From CZUB Factory; "the specs are the same and the only thing that changed is the surface treatment"

    Volquartsen has a Long History of making the Best Upgrade Replacement Extractors on the Market
    I contacted Scott Volquartsen in the fall of 2022 and relayed that I had a lot of customers interested in a Quality Replacement Extractor for the CZ rifle.
    With 25+ years of experience in replacement extractors, I knew they were the right guys to ask, and to my surprise, Volquartsen made a run of A2 Tool Steel Wire EDM Extractors for the CZ 457 rifle.

    CZ 457 Extractor Drawing

    Our first order was a fast sellout, and received well by shooters,
    Without question, Volquartsen it "THE" extractor to upgrade your rifle.
    Order Now! - Ships ASAP!

    Price includes Free Shipping and Tracking - USA Only ~ Sorry No Exports ~

    Our Free Shipping is USA Only

    SKU: VF457EE - In Stock NOW

    Orders Placed Will Ship Next Business Day

    ~ Price includes Free USA Shipping and Tracking ~

    Choose Any Quantity Below USA ONLY ~ Free Shipping ~
    Add Comments Below

    VF457EE - NOTE:
    Update New Shipment In Stock Now ~ Free U.S. Shipping and Tracking

    ~ No Exports on This Item ~
    for Export Orders Volquartsen will export this when it is available from them,
    I will put up a link when available

    👉Click Here to See Installation Video at Volquartsen

    Bolt Shim Instructions
    TriggerShims Snek

    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.
    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. 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 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, 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 receive no benefit you may send your shims back for a Full Refund.

    TriggerShims Bolt Shim Instructions Copyright June/2023

    Tech Tip: Rimfire Headspace
    TriggerShims Snek

    Lance's Tech Tip: Match Chamber and Rimfire Headspace

    The Match Chamber, and Rimfire Headspace are two different things.
    Generally a Match Chamber is simply a chamber that is held to a tighter tolerance than a production rifle chamber using Premium or Match Chamber Reamers
    A discussion of the Match Rimfire Chamber by Eagle Eye Shooting can be found here: (link)

    The Chamber is in the barrel, and with a rimfire rifle, the headspace is in the bolt face. The bolt face is manufactured or machined to an average to function with many types of ammunition, both thick rims and thin, and the bolt is installed in a production rifle with additional space so as not to require hand fitting. Knowing how this works you can check and sometimes the bolt can be adjusted to better fit your favorite ammunition.

    By reading and understanding the information and examples on the CZ page titled;
    TECH TIP PDF: Measuring Headspace on your CZ 457 Rifle by Jack Behrman (link)
    you can see that:
    1) The Chamber is in the Barrel, and does not affect the Headspace
    2) The Headspace is in the Bolt, and it's depth can be measured
    3) The distance between closed Bolt Face, and the Barrel Breech can vary several thousandths of an inch.
    4) The Bolt can be adjusted to move the face forward using shims, and the Barrel can be set back using a lathe, or forward using shims.

    Conditions reported to us over the years by customers on different brands of rimfire rifles but specifically CZ Rimfire Rifles range from too tight and forcing the bolt face against the breech with excessive force, to too loose by as much as 0.006" or more. It is very simple to measure your Bolt Face Headspace using a Depth Micrometer, or Caliper, and then use Jack's example of feeler gauges, or by using our shims as a measuring tool to shim the bolt to touch the breech by feel.
    See my LANCE'S TECH TIP: Rimfire Bolt Shim Installation ~ A General Guide ~ for more information
    Using those two numbers, you can better decide what to adjust for best consistency with the rim thickness of your preferred ammunition. If in the unlikely chance your bolt is too tight from the factory, we manufacture Barrel Shims that can be used to address that problem on CZ rifles by moving the barrel forward. A much more likely scenario is to move a slightly slack bolt forward using our Bolt Shims.
    It is a fact that if you more uniformly chamber your rounds, you can expect better accuracy simply through consistency.


    Isaiah 5:20 Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!

    BOX# Bolt Shim Reviews

    TECH TIP: Bolt Shim Reviews

    Good Morning Lance,
    Another testimonial from a very happy customer. As previously mentioned, I was having failure to extract issues with my CZ457 with a custom ibi barrel. At first I considered that I potentially had a very close tolerance chamber, (which I do - cut with EleyEPS reamer), that was specific for only some types of ammunition. Or perhaps there were imperfections present that interfered with extraction(?). But given the fact that extraction was 100% with some ammo, and dropped to 60-70% with others, led me to measuring rim thickness. There was a consistent difference of 0.002 to 0.003 difference. Bit of a “Aha!” moment. Perhaps there was a bolt/extractor engagement issue. After visiting several websites, chat rooms, etc. I went back to ibi to confirm that I was on the right track. Excellent customer service from these folks, and a subsequent email confirmation that I was on the right path was received. They also list as the go-to for quality products related to bolt or barrel shims. I visited your site, read other folks reviews and committed to giving the bolt shimming process a try. Following the suggested trial/error fitting procedure, I was up to .007 before I noticed a definite resistance on closing the bolt. Backed off and refitted with shims totalling .0065. Resistance was less and it was time to go to the range for confirmation. Priority one was to determine if the ammunition that I was having major extraction issues with would actually cycle properly. Not one failure out of the first 10 rounds. However, I did note a stiff bolt closure on some cartridges Again, following your direction provided on your site, I backed off to .005 and tried again. Fired a full 100 rounds without one failure! Bolt engagement feels just fine. What a revelation! It would be an understatement to say I’m extremely happy with the result. Your shims are an easy install on the CZ457, and allows me to return to one of my favourite ammunition lines with confidence. Thank you again for making such a great product. Believe I will order another set, just in case lol!
    Kindest Regards ~ Stephen in BC

    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!

    Bolt Shims In Production as of
    December 18 2022

    Bolt Shims Sorted by OD Size

    1. .376 x .500 Ruger American Rimfire Rifle Bolt Shims
    2. .376 x .565 CZ 457 Rimfire Bolt
    3. .450 x .565 Winchester 69A / 75S Bolt
    4. .480 x .570 Remington 513
    5. .357 x .595 Remington 540X Bolt
    6. .442 x .595 Mossberg 44 U.S. Bolt
    7. .450 x .595 Marlin 983 Bolt & Remington 504T
    8. .500 x .610 Kimber 82 U.S. Bolt
    9. .480 x .610 Mossberg 144 LSB
    10. .532 x .640 Anschutz 54
    11. .442 x .648 Ruger 77/22 Bolt
    12. .480 x .648 Savage MKII Bolt
    13. .500 x .648 Bergara B14-R Bolt
    14. .511 x .648 Winchester 52 / Suhl 150 Bolt
    15. .550 x .670 Tikka T1x
    16. .570 x .690 Remington 40X Bolt
    17. .595 x .690 Lithgow LA101 Bolt
    18. .610 x .690 CZ / BRNO Bolt
    19. .480 x .751 Walther KK500 Bolt Shim

    * All Available in New 5 Paks

    ~ 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."


    ~ USA ONLY ~

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    MOST Shim orders under $75 DO NOT include Tracking and are sent in a
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    "American Made Gun Shims" - -
    TriggerShims is a Trademark
    Shively Sales
    Michigan Center, Michigan

    Copyright 2008 ~ 2022

    God Bless and Make America Great Again!


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    Lance at

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    And that’s a beautiful thought.”
    ~ Thomas Wolfe