Patent ID: 8453555
Filing Date: 2013-06-04
Classification: F41A

Abstract:
1. A semi-automatic pistol, comprising (a) a barrel having a bore, an outside surface, a front end and a chamber end; (b) a frame; (c) a slide adapted for linear motion along the frame during a firing sequence, the slide having a forward end and a block end, said forward end having an upper cam follower surface on an inside surface adjacent to the barrel and a lower cam follower surface on the inside surface adjacent to the barrel; (d) the barrel having three cam surfaces, comprising a ramp cam surface adjacent to the chamber end of the barrel to effect locking and unlocking of the barrel relative to the slide during the firing sequence, a bottom cam surface and a top cam surface, said bottom cam surface and said top cam surface each on the outside surface of the barrel and extending from the front end toward the chamber end of the barrel, said bottom cam surface having an undulating surface that moves against the lower cam follower surface of the slide and said top cam surface having an undulating surface that moves against the upper cam follower surface of the slide, said undulating surfaces being relative to a longitudinal axis of the barrel, each undulating surface beginning at the front end, curving outwardly relative to the longitudinal axis of the barrel, then curving inwardly relative to the longitudinal axis of the barrel, then curving outwardly relative to the longitudinal axis of the barrel, and then curving inwardly relative to the longitudinal axis of the barrel, said barrel being symmetric about the longitudinal axis at the top cam surface and the bottom cam surface to cause oscillation of the barrel while said slide moves from a battery position to a fully retracted position and back to the battery position during the firing sequence.