The Strike Industries AR shim set for .308/7.62 (Strike Industries part no. SI-AR-SHIM-308) helps time and align a muzzle device on a 5/8-24 threaded barrel. Crush washers are designed to deform once and do not guarantee alignment, while these flat, consistent shims are solid one-piece washers that can be reused. They are the right choice wherever bore alignment is critical, such as a silencer mount, or when the ports of a muzzle device need to land in the correct position. The set contains 13 shims in five precision thicknesses.

Key Specifications

• The thread size is 5/8-24 TPI, the standard for .308 and 7.62 muzzle devices.
• The set includes 13 shims in total.
• Thicknesses are four at 0.075 mm, three at 0.11 mm, three at 0.22 mm, two at 0.34 mm and one at 2.0 mm, so small timing adjustments are possible.
• The shims are SUS 304 stainless steel.
• They are reusable, unlike a crush washer.
• They are solid one-piece shims, flat and consistent.
• The shims assist with timing and alignment and help properly position ports on a muzzle device.

Frequently Asked Questions

What is the difference between a shim and a crush washer? Strike Industries says a crush washer is a one-time-use washer designed to deform and does not guarantee alignment, while shim washers are flat and consistent and should be used whenever bore alignment is critical.

Which thread does this set fit? This listing is the .308/7.62 set for 5/8-24 TPI threads. Strike Industries also makes the set for .223/5.56 on 1/2-28 TPI threads, and that size is not this one.

What thicknesses come in the set? The set has four 0.075 mm shims, three 0.11 mm shims, three 0.22 mm shims, two 0.34 mm shims and one 2.0 mm shim.

Buy the Strike Industries AR Shim Set for .308/7.62, 5/8-24

Getting a brake or mount to index correctly usually comes down to a few hundredths of a millimeter, and a handful of shims solves it without guesswork. Order the set from our Lubbock, Texas gun shop for fast shipping, and browse our other rifle parts.