STRIKE INDUSTRIES AR-15 .223/9mm Crush Washer

Strike Industries offers replacement components for the AR-15 that are made to military specifications. Available in .223 calibers and .308, these high quality components will provide excellent fit and reliable function in your AR series rifle. They come in PRO sets which are 1 piece bulk packages. The S.I. crush washers are great for replacing your used ones and for installing a new muzzle device onto your AR. for .223/5.56/ most 9mm: 1/2"-28 TPI / 1/2"-36 UNEF Inner Diameter: 13mm Features: - Matte Finish to match most muzzle devices- Proper hardness to ensure ease of installation and reliabilityMADE IN THE USA