Flagaway&reg; 10 Pieces Steel Crush Washer 300 7.62x39 308 6.8 5/8x24 Barrel NATO Guaranteed proper fit when safely installing your expensive muzzle device Provides excellent fit & reliable function on your rifle Steel provides maximum barrier against corrosion Makes proper indexing of muzzle device a snap BEWARE OF SELLER: *EXTREME PRECISION LLC* SELLING FRAUD FLAGAWAY PRODUCTS!! BUY FROM -FLAGAWAY- FOR AUTHENTIC ITEMS!