The SureFire SOCOM shim kit for the FH556RC 4-prong flash hider on 1/2-28 threads (brand part no. Z-70031) is how you time a SOCOM muzzle device correctly on a rifle barrel. SureFire supplies each kit with shims in different thicknesses that can be used alone or stacked to reach proper alignment. The color coding means there is no need to measure to know the thickness. This particular kit is the one SureFire lists for the FH556RC-1/2-28 flash hider.

Key Specifications

• The kit is the FH556RC-1/2-28 shim kit, the one SureFire pairs with the 5.56mm four-prong flash hider.
• The thread size is 1/2-28, matching the 5.56mm muzzle device it supports.
• The shims are 300-series stainless steel, chosen for durability and long service life.
• Each kit holds shims of different thicknesses, which can be used alone or combined to get the muzzle device aligned.
• The shims are color-coded, so you can identify thickness without measuring.

Frequently Asked Questions

Which device does this shim kit fit? SureFire lists this kit for the FH556RC SOCOM four-prong flash hider in 5.56mm on 1/2-28 threads. Other SOCOM muzzle devices use different kits.

What do the shims do? They help ensure precise timing of a SureFire SOCOM muzzle device on a rifle barrel. The shims can be used alone or combined to achieve proper alignment.

Buy the SureFire SOCOM Shim Kit for the FH556RC, 1/2-28

Getting the timing right is a small job that decides whether a muzzle device seats properly, and a matched kit makes it simple. Order it from our Lubbock, Texas gun shop for fast shipping, and see more Class 3 parts and accessories.