ENTER THE VANG COMP BARREL MODIFICATION SYSTEM.
Mr. Vang devised a system of lengthening the forcing cone of the shotgun barrel to allow a smoother transition of the shot column from chamber to bore, thus decreasing recoil and shot deformation. He would then further back-bore the barrel so that the shot column gradually tapered and squeezed together as it traveled down the bore towards the muzzle. Before they get to the muzzle, the hot expanding gasses which account for the muzzle flash are jettisoned through a precisely-calculated and rigorously-tested array of compensation ports. This hot gas is discarded through 62 holes, 31 on either side of the front sight which contributes to the flat shooting, reduced felt recoil, eliminated muzzle flip and diminished muzzle flash characteristics of the Vang Comp System.