US-DEALS 5 Pieces Steel Crush Washer 300 7.62x39 308 6.8 5/8x24 Barrel NATO 50 PCS !!! - You can ask for a FULL REFUND if you buy from sellers other than US-DEALS because they are selling COUNTERFEIT products!! Provides excellent fit & reliable function on your rifle Steel provides maximum barrier against corrosion Makes proper indexing of muzzle device a snap Guaranteed proper fit when safely installing your expensive muzzle device