The Brownells Short Muzzle Brake is designed for AR-15s, providing maximum braking with minimal length, featuring a 1-inch overall length and two rows of 0.125" ports.
Available in either tool steel with a black oxide finish or stainless steel, it comes with wrench flats for easy installation and has a 0.75" OD with 1/2-28 threads.
It is specifically sized for 22 caliber (.223-.224) bullets, and should not be used with bullets larger than .223/5.56.