LBE Unlimited ARCW-5.56 Crush Washer 4140 Steel Black 5.56x45mm NATO AR-15

The LBE Unlimited ARCW-5.56 Crush Washer is a single-use alignment shim designed to seat and index flash hiders and muzzle brakes on a 5.56x45mm NATO AR-15 barrel. When a muzzle device is threaded on, the crush washer deforms under torque to take up the thread gap, lock the device solidly against the barrel shoulder, and keep the gas ports or compensator prongs clocked exactly where you want them.

Cut from 4140 steel and finished in a protective black coating, this washer is sized specifically for the common 5.56 thread pitch used on AR-15 barrels and is intended as a service item - install, torque to spec, and replace whenever you change muzzle devices. It follows the standard crush-washer format favored by armorers and home builders for general-purpose AR work, giving you a clean, repeatable seat shot after shot.

Drop one in when you are mounting a new compensator, installing a fresh flash hider on a rebuilt upper, or simply replacing a washer worn out from a previous swap. The ARCW-5.56 is a brand-new, current-production LBE Unlimited component ready to go straight into your next AR-15 build.