A couple of links......
AK47 Krinkov Muzzle Brake - AK47 AK74 MAK 90 MAADI by Combathunting.com
Ak Muzzle Brake Krinkov Brake
Ak Muzzle Brake Krinkov Brake
Russian military pattern provides effective flash and recoil control. For 7.62mm, pre-ban, AK-47 pattern rifles with 14mm-1.0...