For $30 this Century Arms M109 Muzzle Brake works well with the Zastava M72B1 RPK Carbine. This brake directs most of the recoil toward the shooter, with only a slight muzzle rise. The simple design makes it easy to clean off the gun powder residue. The 1.5 inch length and 1.5 ounce weight keeps your rifle length short without adding much mass. Highly recommended for the heavy barreled RPK carbines.