Rap4 Narc Muzzle Break (22 Muzzle Threads) 29.00 USD 14.45 USD Narc Muzzle Brake barrel tip. Can be attached to barrels with 22mm Muzzle threads. The product is currently out of stock. Share Article Number: 989 Information Reviews Narc Muzzle Brake barrel tip. Can be attached to barrels with 22m Muzzle threads.