Tacfire .223/.556 1/2inX28 Thread Bird Cage A2 Muzzle Brake/Steel Black. 223/.556 1/2x28 Thread Bird Cage Muzzle Brake redirects muzzle blast and sound forward away from your shooting location. This muzzle brake by TacFire features two recoil lugs on top of an elastomer piston on the top of the brake which are there to absorb the muzzle blast and redirect it to the sides of the shooter. The Tacfire .223/5.56 1/2x28 Thread Bird Cage Muzzle Brake attaches to the muzzle blast and is a A2 style muzzle brake. Users can count on the efficiency of the Tacfire .223/5.56 1/2 X 28 Thread Bird Cage Muzzle Brake as one of the most effective muzzle brakes on the market. Specifications for Tacfire .223/.556 1/2inX28 Thread Bird Cage Muzzle Brakes: Manufacturer: TacFire Condition: New Package Contents: Tacfire .223/.556 1/2inX28 Thread Bird Cage Muzzle Brakes Tacfire MZ1001-A2: .223/.556 1/2inX28 Thread Bird Cage A2 Muzzle Brake/Steel Black