AK47 Muzzle Brake - Beryl Style 1/2x28 Threads
For 5.56 or 7.62
These are modeled after the Original Polish Beryl Rifle's muzzle brake. This brake has recessed threads so it will sleeve over a barrel slightly (see photos). Made in the U.S.A. So they also count as a US 922r part.
Ports are at approximately 1 o'clock, 4 o'clock, and 8 o'clock (from shooter's perspective).