The YHM Barrel Shim Set (brand part no. SHIM-3102-SET) gives you the thin steel shims needed to properly index a muzzle device on a threaded AR-platform barrel. When a flash hider, brake, or thread protector doesn’t land in the right rotational position at full torque, a shim or stack of shims takes up the extra gap so the device times correctly without over- or under-tightening. This set is sized with a 1/2 in. inner diameter to match common AR-15 barrel threads, and it includes six shims so you have options to build up exactly the thickness you need. It’s a small, inexpensive fix for a common headache when installing muzzle devices.

Key Specifications

• Includes a set of 6 barrel shims.
• Sized with a 1/2 in. inner diameter.
• Constructed of stainless steel.
• Used to align and time a muzzle device on the barrel thread.
• Compatible with AR-15 barrels.
• Shim breakdown of two 0.002 in., three 0.005 in., and one 0.020 in. shim for precise thickness stacking.
• Designed to pair with YHM’s 5.56mm quick-detach muzzle brakes.
• Made in the USA.

Frequently Asked Questions

What are barrel shims used for? They take up rotational gap so a muzzle device times correctly at full torque instead of stopping in the wrong position.

How many shims come in the set? Six, giving you options to stack the exact thickness you need.

Buy the YHM Barrel Shim Set

Get your muzzle device timed correctly with the YHM Barrel Shim Set. Order this 1/2 in. I.D. 6-pack from our Lubbock, Texas gun shop for fast, direct shipping, and browse more muzzle device accessories from the full Yankee Hill Machine lineup we carry.