SureFire Muzzle Brake/Suppressor Adapter 5.56mm M16/AR 1/2-28 Threads NSN 1005-01-668-7486 SFMB-556-1/2-28. These Muzzle Brakes & Compensators made by SureFire vastly reduce recoil and muzzle rise which greatly improves accuracy and allows you to set...