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.  18T flash hider is an 18 tooth mount designed the for Advanced Armament's first generation, fast attach silencers. Not compatible with the 51T ratchet mount or 90T ratchet mount taper silencers. All models are available in sizes to fit rifles chambered in 5.56mm/.223 (1/2"-28 tpi muzzle threads) or 7.62mm/.308 (5/8"-24 tpi muzzle threads).