The EFAB Muzzle Brake from Precision Armament combines superior muzzle control with effective flash suppression, even on barrels as short as 10 inches. Patent Pending EFAB(TM) technology uses an array of diverging expansion nozzles to diffuse and cool combustion gases resulting in maximum recoil reduction with minimum concussion to the rear and sides of the shooter. Closed bottom section for less dust signature when shooting prone Precision machined from heat treated stainless steel Advanced Ionbond high temperature CrCN coating for extreme durability Fits .308/7.62mm rifles with 5/8-24 threads Features pilot hole for permanent pinning to bring 14.5 Mfg: Precision Armament