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And she brought forth her firstborn son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn. And there were in the same country shepherds abiding in the field, keeping watch over their flock by night. And, lo, the angel of the Lord came upon them, and the glory of the Lord shone round about them: and they were sore afraid. And the angel said unto them, Fear not: for, behold, I bring you good tidings of great joy, which shall be to all people. For unto you is born this day in the city of David a Saviour, which is Christ the Lord. And this shall be a sign unto you; Ye shall find the babe wrapped in swaddling clothes, lying in a manger. And suddenly there was with the angel a multitude of the heavenly host praising God, and saying,

Glory to God in the Highest, and On Earth Peace, Good Will Toward Men.

From Our TriggerShims Family to Yours

Merry Christmas

TriggerShims
Mossberg Rimfire Rifles

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Rebellion Against Tyrants is Obedience to God
~ Benjamin Franklin ~

Manufacturer of
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

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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

Mossberg Gun Data Home Page

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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

Also Fits: H&R M12

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

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1


Moss144

Mossberg Model 144 Bolt Shims

Mossberg Model 144 Small-Bore Target Rifle Bolt Shims

Known to fit: Mossberg 146B-A, 640KA, 144LS, 144LSA, 144LSB

Should Also Fit 140K, 140B, 142A, 142K, 142M,

Shim Measurements .480" X .610"

Bolt Measurements .461"/.464" X .621" / .624"

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

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1


Bolt Shim Instructions
Bolt Shim Instructions
TriggerShims Snek

LANCE'S 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.
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 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. 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. 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, did I explain that clearly?
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.

TriggerShims Bolt Shim Instructions Copyright June/2023

Click Here for ~ Everything You Need To Know About Headspace from Kurt the Gunsmith

V4/2024


TriggerShims Snek

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

  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 5 Bolt Shims
  11. Remington 40X Bolt Shims
  12. Remington 504T Bolt Shims
  13. Remington 513T / 521T Rimfire Rifle
  14. Remington 540X Bolt Shims
  15. Ruger American Rimfire Bolt Shims
  16. Ruger 77/17 77/22 Bolt Shims
  17. Savage BMag Bolt Shims
  18. Savage MKII Bolt Shims - Prototype
  19. Springfield Armory Model 2020 Rimfire
  20. Suhl 150 Rimfire Rifle
  21. Tikka T1x and Sako P72 / M78 Rimfire Rifle / Walther KK300
  22. Walther KK500 Rimfire Bolt Shims
  23. Winchester 43 and 52 Bolt Shims
  24. Winchester 69 and 75 Bolt Shims
  25. ~ Barrel Shims ~

  26. CZ 455/457 Barrel Shims
  27. CZ 455/457 XL Barrel Shims
  28. 10/22 Barrel Shims
  29. 2500X and Trident Barrel Shims
  30. 3/4" Shank Bull 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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"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

Republic.... I like the sound of the word. It means people can live free, talk free, go or come, buy or sell, be drunk or sober, however they choose. Some words give you a feeling. Republic is one of those words that makes me tight in the throat - the same tightness a man gets when his baby takes his first step or his first baby shaves and makes his first sound as a man. Some words can give you a feeling that makes your heart warm. Republic is one of those words. - John Wayne in the Alamo