Gas Operated Rotary Barrel Action and Pistol

A pistol, said pistol comprising:

• a frame;
• a cam fixedly mounted on said frame;
• a slide movably mounted on said frame, said slide defining a first groove extending lengthwise therealong;
• a tube fixedly mounted on said frame between said slide and said frame;
• a barrel positioned within said tube, said barrel having a longitudinal axis and defining a bore coaxial therewith;
• a cam follower mounted on said barrel, said cam follower being engageable with said cam for rotating said barrel about said longitudinal axis;
• a first lug mounted on said barrel and projecting outwardly therefrom, said first lug being engageable with said first groove upon rotation of said barrel about said longitudinal axis;
• a thrust surface projecting outwardly from said barrel toward said tube, said thrust surface facing a reaction surface projecting from said tube toward said barrel, a gas space being defined between said thrust surface and said reaction surface;
• a port in said barrel extending between said bore and said gas space.