Our Birdcage Muzzle Brake/Flash Hider with 5 Port and solid bottom is designed in the standard A2 style with 1/2"x28 thread pitch. It's constructed of solid 4150 steel and has a high quality Black Phosphate finish. 

Features:

• Solid 4150 steel construction
  
• Phosphate finish
  
• Birdcage with 5 slots
  
• 1/2"x28 thread pitch
  
• Fits: AR-15
• For 556NATO, 223REM