The Reverb Muzzle Brake is a compact muzzle compensator that will work with any round under 9mm in diameter (i.e. 300 Blackout, 5.56mm, etc) on 1/2 x 28 tpi threaded barrels. The design features three slots on each side to help keep the muzzle down under both single shots and rapid fire. The Reverb Muzzle Brake is  marked “MA” and “9mm” to denote that it is made right here in the USA by Manticore Arms for any weapon up to 9mm caliber and comes with a crush washer. It is a standard 22mm diameter allowing for the use of most standard NATO muzzle accessories.