AIM Sports Inc AR15/M4 A2 Style Muzzle Brake Black Small. 223/5.56 barrels. These Muzzle Brakes & Compensators by AIM Sports Inc feature open top slots a closed bottom and a blocked end which increases muzzle control. For those West coast customers the AIM Sports A2 Muzzle Brake 5.56 Cal reduces dust signature making it compliant with California Featureless laws. The AIM Sports A2 Tactical Muzzle Brake Attachment is the ultimate solution to control recoil from your firearm. Please note that this device will not reduce or remove flash. Specifications for AIM Sports Inc AR15/M4 A2 Style Muzzle Brake: Manufacturer: AIM Sports Inc Color: Black Caliber: 5.56x45mm NATO .223 Remington Threads per Inch: 1/2x28 Gun Make: AR Platform Length: 2 in Weight: 2.5 oz Condition: New Diameter: 1 in Features of AIM Sports Inc AR15/M4 A2 Style Muzzle Brake Increases muzzle control Reduces dust signature Closed front design reduces recoil 1/2" x 28 threads Compatible with .223/5.56 barrels Package Contents: AIM Sports Inc AR15/M4 A2 Style Muzzle Brake AIM Sports Inc PJ006T: AR15/M4 A2 Style Muzzle Brake Black Small