The AAC Brakeout Flash Hider Muzzle Brake combines the best features of AAC's Blackout flash hiders and Blackout muzzle brakes into a single, high performing unit. The Breakout's rear muzzle brake chamber is open on both sides and on the top for reduced perceived recoil & muzzle rise, yet closed on the bottom for minimal environmental disturbance when shooting from the bench or prone positions. The 3-prong front end incorporates elements of the Blackout flash hider's effective design to minimize muzzle flash. All Breakout flash hider muzzle brakes are machined from high strength aerospace 17-4 stainless steel alloy and coated in a hard, durable, corrosion resistant SCARmor finish. This 51T Brakeout works in conjunction with AAC's improved ratchet mount sound suppressors. The 51-T mount is an intuitive, lightning fast silencer attachment/detachment system that allows for secure installation of a suppressor in less than 3 seconds with no tools or moving parts. Not compatible with the older spring mount (18-Tooth) or newer ratchet taper mount (90-Tooth) sound suppressors.