Advanced Armament Corporation Muzzle Brake Mk13-sd 7.62mm 90t 5/8-24. 62mm 90t 5/8-24 Specifications for Advanced Armament Corporation Muzzle Brake Mk13-sd 7.62mm 90t 5/8-24: Manufacturer: Advanced Armament Corporation Color: Black Cartridge: 7.62x51mm...