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TriggerShims
Mossberg Rimfire Rifles

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Trigger Shims Brand
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Gun Shims
Gun Smith Supplies
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

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

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~ Send Lance an Email ~

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American Made Gun Shims for Mossberg

Mossberg Rimfire Rifles

Mossberg 44 U.S.

Helpful Links

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your one-stop shopping site for Mossberg® parts



Moss44

Bolt Shims for Mossberg 44 U.S.

Mossberg 44 U.S. Training Rifle Bolt Shims
May Fit Other Models

Model 44 U.S. Bolt Shims .442" X .595" Now In Stock

Mossberg 44 U.S. Bolt and Bolt Shims

These are the Original TriggerShims Brand Mossberg 44 U.S. Rifle Bolt Shims

TriggerShims was asked by an Arkansas Shooter to make shims for this bolt
Thanks to Ray in Arkansas for helping develope this shim

Used as a measuring device and an adjustment tool as needed, shims are installed until the Bolt just touches the barrel face, and then reduce by .001"

Properly fitted our bolt shims can correct light strikes and reduce flyers caused by a loose bolt

Sold in paks of 4 to check and adjust bolt to barrel fit and correct wear

Should fit civilian models 42 / 43 / 44 and may for other models with a minor diameter of .43" and a major diameter of .61"

A 4 or 5 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  *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

Mossberg Model 44 U.S. Bolt Shims .442" X .595"

Item # SS-Moss44/BS

Click Box to Choose Different Quantities

Mossberg 44 Bolt Shim 442 X 595
Choose Assortment Shim Pak
Enter Choice / Request Below

Moss144

Mossberg Model 144 Bolt Shims

Mossberg Model 144 Small-Bore Target Rifle Bolt Shims

Should Also Fit 140K, 140B, 142A, 142K, 142M, 144LS, 144LSA, 144LSB

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  *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

.480 X .610 Mossberg 144 Bolt Shims

Item # SS-Moss144/BS

Click Box to Choose Different Quantities

Mossberg 144 Bolt Shim 480 X 610
Choose Assortment Shim Pak
Enter Choice / Request Below

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 ~





But a constitution of government once changed from freedom can never be restored. Liberty, once lost, is lost forever ~ John Adams

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!

BY PURCHASING SHIVELY SALES PRODUCTS
YOU ASSUME ALL RESPONSIBILITY FOR THEIR SAFE INSTALLATION AND USAGE.
YOU RETAIN ANY AND ALL RESPONSIBILITY FOR YOUR OWN ACTIONS. Be Safe!!

If you have any questions or safety concerns, see a qualified Gunsmith.

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Lance at Webmaster@TriggerShims.com

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