Fighter muzzle break is designed for AK47 (AKM), to provide recoil reduction and lower muzzle flash signature. 

Fighter Brake is with 14-1 mm LH thread

Fighter Brake will clear any projectile up to .30 caliber (0.311").
Made in USA, so it counts towrads 922r!
Weight: 1.3oz
Lenth: 1.73"
Nitrite finish 

Video Info:

On AK