NcSTAR Crush Washer For AR Muzzle Brake Black Pack of 3. Includes 3 each Crush Washers in the packaging. Specifications for NcSTAR Crush Washer For AR Muzzle Brake: Manufacturer: NcSTAR Color: Black Gun Model: M4 AR-15 Features of NcSTAR Crush Washer For AR Muzzle Brake: This allows you to properly time your muzzle brakes and flash hiders on your barrel so that the ports are facing the correct directions for optimum performance Steel Construction with Black finish Outside Diameter: 0.75" Inside Diameter: 0.50" Individual Weight: 0.1 oz. Package Contents: NcSTAR Crush Washer For AR Muzzle Brake What firearm models does the manufacturer say NcSTAR Crush Washer For AR Muzzle Brake is compatible with? The manufacturer suggests that NcSTAR Crush Washer For AR Muzzle Brake is compatible with AR-15 M4NcSTAR AARCW: Crush Washer For AR Muzzle Brake Black Pack of