The Advanced Armament (AAC) 51T Muzzle Brake 64178 is a factory muzzle device designed for rifles chambered in .30 caliber cartridges utilizing common 5/8x24 muzzle threads. In addition to reducing recoil and muzzle rise during unsuppressed firing, the brake serves as the mounting interface for AAC suppressors utilizing the proven 51-Tooth ratchet mounting system.
Machined from steel and finished in black, the 51T Muzzle Brake offers excellent durability while providing repeatable suppressor alignment for compatible AAC Legacy suppressors. The precision-machined 51-tooth mounting interface allows fast suppressor attachment while helping maintain a secure lockup during extended shooting sessions.
The brake's multi-port design redirects propellant gases to reduce rearward recoil impulse and improve muzzle stability, making rapid follow-up shots easier whether shooting from the bench, in competition, or in the field. Shooters already invested in the AAC 51T suppressor ecosystem will appreciate maintaining compatibility with one of the most recognizable suppressor mounting systems ever produced.
Whether replacing a worn muzzle device or setting up another rifle for an existing AAC suppressor, the AAC 51T Muzzle Brake provides a genuine factory mounting solution for legacy 51T suppressor owners.