Abstract: A muzzle clamp assembly, adapted for use with a multi-barrel gun of the Gatling type, for predictably controlling the dispersion, i.e., the impact point of projectiles fired from the multi-barrel gun. The assembly is removably attached to the forward end, i.e., the muzzle end, of the barrel cluster; and, it includes a perforated cylindrical clamp member, a plurality of movable and removable clamps, and a removable perforated front plate with the perforations at positions preselected to effectuate the desired controlled dispersion. These components are assembled and integrated in an untightened condition; are slipped over the muzzle end of the cluster of barrels; and, the movable clamps are tightened to the barrels, while the front plate is tightened to the clamp member. This front plate thereby positions the muzzles of the barrels to effectuate the preselected desired controlled dispersion of the fired projectiles, such as a dispersion pattern of 360.degree. about a theoretical focal point.