Strike Industries AR .223 Crush Washer - 10pcs set Black One Size. 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. Specifications for Strike Industries AR Crush Washer: Manufacturer: Strike Industries Color: Black Features of Strike Industries AR Crush Washer Available in .223 or .308 PRO package include 10 pieces Matte Finish to match most muzzle devices Proper hardness to ensure ease of installation and reliability Package Contents: Strike Industries AR Crush Washer Strike Industries SI-AR-CW-PRO-223: AR .223 Crush Washer - 10pcs set Black One Size