Guntec USA AR-15 Crush Washer 1/2x28 Steel - Matte Black

The Guntec USA AR-15 Crush Washer is a steel indexing washer designed for use with standard 1/2x28 threaded AR-15 muzzle devices. When a muzzle brake, compensator, or flash hider is torqued against this washer, it deforms slightly under pressure so the shooter can precisely time the orientation of the device's ports or slots before final installation.

Cut from steel with a matte black finish, this crush washer is dimensioned for the .223 Remington / 5.56 NATO barrel thread pitch used on the vast majority of AR-15-pattern barrels. It is a small, low-cost consumable that should be replaced each time a muzzle device is removed and reinstalled, making it a smart spare to keep on hand for any AR-15 build or service.