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Remington Gun Shims

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American Made Gun Shims for Remington

PAGE INDEX

Remington Model 40X Bolt Shims

Remington Model 40X Small-Bore Target Rifle Bolt Shims

The Remington Model 40X Small-Bore Target Rifle was introduced in 1955 and chambered for the .22 Caliber Long Rifle Cartridge

Bolt Shims for 1950’s Vintage Remington 40X Target Rifles that were also sold at CMP up through 2010+

Also may fit other models, check your bolt size to confirm
Rem 40X Bolt Shim ~ .570" X .690"

How do Bolt Shims work?

A two-piece bolt requires a precise fit to hold the cartridge rim closely against the breech without crushing it, allowing adjustment to custom-fit your rim thickness.

Installing our Bolt Shims between the two bolt halves eliminates excessive internal slop and rearward endplay. This creates a solid mechanical setup that prevents the bolt from backing away under impact, ensuring maximum firing pin energy transfer to eliminate misfires and light strikes while enhancing 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. Excessive headspace causes the bolt to feel loose.
Also Used for Adjusting after Re-Barreling

If you are getting misfires and light strikes or are chasing accuracy, shimming the bolt may be a good way to solve it.

Remington 40X Bolt Shim 4 Pak include;
1 X .002" - 1 x .003" - 1 X .004" and 1 X .005"

Total of .014" potential adjustment so you will be assured
to have more than needed to adjust one rifle.

NOTE: Be Advised this bolt may have taper pins that must be pressed out in the right direction.
I have found they also have straight pins that are 5/64" Diameter

~ Click Here for Rem 40XB Parts and Diagram ~

.570" X .690" Remington 40X Bolt Shims

Item # SS-REM40X/BS

Click Box to Choose Different Quantities

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1

Special Thanks to Tim for Field-Testing and Photo's

👉Remington 40X Field Service Manual

TECH TIP VIDEO: Remington 40XB with TriggerShims.com Bolt Shims

Remington Model 540X Bolt Shims

Remington Model 540X Small-Bore Target Rifle Bolt Shims
Also Fits Remington 541T

Fits all 540 / 541 Series

Should Also Fit Remington 580 581 582

.357 X .595 Remington 540X Bolt Shims

Item # SS-REM540X/BS

Click Box to Choose Different Quantities

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1

The Bolt Assembly Pin is KNURLED on one end, and would require great care to disassemble. After disassembly, you would want to locate a split pin available from a hardware store, cut to the correct length and sanded down on the OD so it just fits with hand pressure for shim testing.
Replacement Bolt Assembly Pin Pictured Product # 707620C available at Numrich Gun Parts Corp

I received your shim kit and installed it on my Remington 541-S and the 4 thousandths shim was perfect - nice and tight now. No more misfires!! And it feeds much better.
First 20 rounds into 5/8" at 50 yards with CCI standard velocity economy ammo... unbelievable!
Thanks for a great product. I had been trying for some time to stop the misfires. Wayne in NH

Remington Model 504T Bolt Shims

Remington Model 504 and 504T
Small-Bore Target Rifle Bolt Shims

.450 X .595 Remington 504T Bolt Shims

Item # SS-REM504T/BS

Click Box to Choose Different Quantities

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1

Remington Model 513T Bolt Shims

Remington Model 513 and 513T
Remington 521 and 521T
Small-Bore Target Rifle Bolt Shims

.480 X .570 Remington 513T Bolt Shims

Item # SS-REM513T/BS

Click Box to Choose Different Quantities

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1

Thanks TriggerShims Field Tester Todd Moody for his help on this shim

Remington Model 5 Bolt Shims

Remington Model 5
.22 Rifle Bolt Shims

Remington Model 5 manufactured in Serbia by Zastava Arms
Model 5 also sold under Interarms and Charles Daly

Fits:
Zastava CZ99 and/or MP22 (depends when made)
Remington Model 5
Charles Daly MP22

These Shims Measure .442" X .555"

Fits Bolt Size .433" X .590" plus/minus .005"

.442 X .555 Remington 5 Bolt Shims

Item # SS-REM5/BS

Click Box to Choose Different Quantities

👉Link To: ADD USPS TRACKING UPGRADE with SHIPPING PROTECTION

👉Link To: INTERNATIONAL TERMS / POSTAGE $1

Bolt Shims - Joe Berk Blog

Post from Our Friend Joe Berk's
The ExhaustNote Blog

Joe Berk writes a blog on TriggerShims Bolt Shims in his Remington 504 and CZ452 Varmint. Joe's Blog shows the targets he shot and improvement in accuracy in his two fine rimfire rifles.
Click the photo to visit Joe's Blog Post on The ExhaustNotes Blog or
CLICK HERE for Joe's The ExhaustNotes Blog Link
Please leave a comment and tell him Lance at TriggerShims.com sent you!

Bolt Shim Instructions

Bolt Shim Instructions

LANCE'S TECH TIP:
Rimfire Bolt Shim Installation
~ A General Guide ~

---

1. Understanding Rimfire Headspace

Unlike centerfire cartridges where headspace is measured from the shoulder, the .22 LR is rim-headspaced. The total dimension from the recessed bolt face to the barrel breech face determines how much "play" or clearance the cartridge rim has.

Rimmed cartridges utilize the thickness of the cartridge rim for head-spacing. A two-piece bolt requires a precise fit to hold the cartridge rim closely against the breech without crushing it. Installing our Bolt Shims between the two bolt halves eliminates excessive internal slop and rearward endplay, creating a solid mechanical setup that maximizes firing pin energy transfer to eliminate misfires and light strikes while enhancing accuracy.

Generally speaking, factory production rifles leave extra room between the bolt face and the breech to accommodate a wide variety of ammunition with varying rim thicknesses. You should first measure the depth of your bolt face pocket to ensure it meets SAAMI headspace 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.

2. How to Fit and Measure Your Shims

You can use our color-coded numbered shims like a gauge to find exactly when the bolt face touches the barrel breech face. From there, you can calculate your ideal bolt headspace depth based on your preferred ammunition's rim thickness.

• Fit by Feel: I cannot tell you which specific shim will work best with your rifle; you determine that yourself by fitting, feel, and live-fire testing.
• Measure in the Rifle: Installing Bolt Shims requires fitting by hand and checking with the bolt fully installed and locked down in the rifle action. Do not attempt to measure this with the bolt removed from the rifle.
• Use an Empty Chamber: To establish the proper bolt-to-breech fit, shims must always be fitted on a completely empty chamber.
• Extractor Tip: If possible, removing the extractors on some rifle models during the fitting process will give you a much better "feel" for the bolt face making contact.
• Finding the Stack: Start with a 4 or 5-pack of shims. Install the thinnest shim (.0015" or .002") and check how your bolt closes. If it closes normally, continue trying sequentially thicker shims (or stacking them if necessary) until the bolt handle begins to close harder than normal.
• Identifying the Slack: The exact point where your bolt begins to close hard indicates the total amount of mechanical slack that was present in your bolt layout.

3. Fine-Tuning the Fit

• Step Back One Number: Once you find the thickness that causes the bolt handle to close tight, remove that setup and step back by .001". For example, if a .005" Red Shim causes the bolt handle to close harder than normal, remove it and install a .004" Purple Shim.
• Avoid Undue Stress: If you have to force or put undue stress on your bolt to close it, you must reduce the shim thickness. Forcing the bolt closed puts premature wear on the shims and will not increase accuracy.
• Target Feel & Final Calculation: When you have the correct shim thickness installed, your bolt should close normally or just ever-so-slightly tighter than normal. At this point, you have successfully used the shims to tune the space available for your cartridge rim. By comparing your factory bolt pocket depth to your ammunition's rim thickness, you can determine exactly how much shim thickness to leave inside the bolt assembly to adjust your excess headspace.

  Example:

  • Your factory Bolt Pocket Depth measures a tight .038".
  • Your favorite ammunition has a Rim Thickness of .041" (meaning the cartridge rim is physically .003" thicker than the factory pocket depth).
  • By testing, you find it takes a .005" shim to completely eliminate internal slack and bring the bolt face up flush to the breech face.
  • Because you have a .038" bolt pocket and a .005" shim to touch the breech, backing up by just .002" leaves a .003" shim inside your bolt assembly to completely address your headspace issue.
  • Because of slight variations in rim thickness, it is better to be slightly loose rather than a slight crush, so trying the .003" shim and .002" shim for best fit is recommended in this example.
• Lubrication: For the longest shim life, apply a very small drop of oil or a tiny smear of grease to the shim before final installation.

4. Range Testing & Maintenance

Now you can go to the range. With the barrel pointed in a safe direction, check the fit with your favorite ammunition.

Due to natural variations in rim thickness across different ammunition brands, you may occasionally need to adjust your shim stack. Remember, you have already removed the excess mechanical headspace from the bolt assembly; your goal now is simply to fine-tune the clearance to find the "sweet spot" for your preferred cartridge rim thickness.

If you ever have safety questions or want to verify your dimensions, always use a dedicated rimfire headspace gauge to check your work.

Consistent chambering yields consistent results. Your satisfaction is guaranteed. If you feel you receive no benefit, you may send your shims back to TriggerShims for a full refund.

TriggerShims.com (Shively Sales)

Quality Gun Shims Made in the USA

TriggerShims Bolt Shim Instructions Copyright 2008 - 2026 V9-10/8/2026

Click Here for Printable PDF

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. Holeshot 2500X Target Rifle Bolt Shims
   
6. Kimber 82G Target Rifle Bolt Shims
   
7. Lithgow LA 101 and SA 2020 Rimfire
   
8. Marlin 80 / 983 Rimfire Bolt Shims
   
9. Mossberg 44 U.S. Bolt
   
10. Mossberg 144 LSB Bolt
    
11. Remington 5 Bolt Shims
    
12. Remington 40X Bolt Shims
    
13. Remington 504T Bolt Shims
    
14. Remington 513T / 521T Rimfire Rifle
    
15. Remington 540X Bolt Shims
    
16. Ruger American Rimfire Bolt Shims
    
17. Ruger 77/17 77/22 Bolt Shims
    
18. Savage BMag Bolt Shims
    
19. Savage MKII Bolt Shims - Prototype
    
20. Springfield Armory Model 2020 Rimfire
    
21. Suhl 150 Rimfire Rifle
    
22. Tikka T1x and Sako P72 / M78 Rimfire Rifle / Walther KK300
    
23. Turbo V3 / Flash Turbo Bolt Shims
    
24. Walther KK500 Rimfire Bolt Shims
    
25. Winchester 43 and 52 Bolt Shims
    
26. Winchester 69 and 75 Bolt Shims
    

~ Barrel Shims ~

27. CZ 455/457 Barrel Shims
    
28. CZ 455/457 XL Barrel Shims
    
29. 10/22 Barrel Shims
    
30. 2500X and Trident Barrel Shims
    
31. 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

Remington 870 / 1100 Trigger Shims

.156" X .310"

Trigger Shim Pak Assortments BELOW are as follows;

2 Pak comes in .002"
4 Pak comes with 2 each .002" and .003"
6 Pak comes with 2 each .002", .003" and .004"
8 Pak comes with 2 each .002", .003", .004" and .005"
12 Pak comes with 4 each .002", .003", .004"
20 Pak comes with 4 each .002", .003". .004", .005" and .006"
24 Pak comes with 6 each .002", .003", .004" and .005"
30 Pak Gunsmith Special Assortment comes with 6 each .002", .003", .004", .005" and .006"
-OR-
Choose ANY Pak and Specify Your Requested Thickness in Comment Box
Available in Stainless Steel ~ .002" - .009" Thickness

156X310 ~ Universal 1022 Hammer / REM 870 T Shim

2 Pak $6.00 USD 4 Pak $9.00 USD 6 Pak $11.00 USD 8 Pak $12.50 USD 12 Pak $18.00 USD 20 Pak $22.00 USD 24 Pak $25.00 USD 30 Pak $29.00 USD 50 Pak $45.00 USD

Shim Thickness

Regular Assortment Your Choice

Enter Choice / Request Below

Remington 700 Rifle
Reduced Power Trigger Spring

Trigger Spring for Remington 700 Only -
Reduced Power - Improved let-off and trigger pull.
Long and Short Actions

Remington Rifle Extra Power Ejector Spring

700, 721 and 722 Series
Stock No. 33243........8.95 Free USA Only Shipping

Wolff Blitzschnell Speed-Lock Striker Springs for
Remington Bolt Action Rifles - Extra Power

700, 721 and 725 Long and Short Actions

Note: Factory Standard Spring Weight is #24
Our Extra Power Springs are #28 - The Most Popular Weight

Note: 40X Centerfire use No. 63428

Stock No. 63428 Short Action #28 ..........$14.95 Free USA Only Shipping
Stock No. 63528 Long Action #28 ..........$14.95 Free USA Only Shipping

Choose Short or Long Below 63428 Short Action $14.95 USD63528 Long Action $14.95 USD

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

All Website Orders Received by 4 PM are Shipped the Next Business Day

I will Ship Shims to USA, Canada and International

Gun Parts Shipped to USA Only

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

All Material Copyright of Lance Shively
2008 ~ 2026

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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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