Three equally-spaced horizontal prongs efficiently reduce muzzle flash to help minimize the blinding effect of the flash on the shooter in low-light conditions. Short OAL and flat, smooth muzzle face with rounded edges prevents hang-ups and aids in unencumbered weapon deployment. Precision machined from heat-treated steel and finished with AA's proprietary SCARmor coating that gives high surface hardness for added resistance to blast erosion. 51T models have an integral 51-tooth ratchet mount that accepts Advanced Armament sound suppressors. All models are available in sizes to fit rifles chambered in 7.62mm/.308 (5/8"-24 tpi muzzle threads). Mfg: Advanced Armament SPECS: 17-4 stainless steel, SCARmor finish, matte black. 51T 7.62 - 2½" long. 7⁄8" dia. 3.5 oz. (98g) wt.