Firearm frame including a firearm barrel and trigger mount control mechanism

In a firearm having a reciprocating slide with a guide rod and a barrel which translates and rotates during recoil, the improvement comprising

• a) a frame constructed of plastic material which frame includes a cavity with a plurality of frame wall surfaces;
• b) cam block means on the guide rod which cam block has a plurality of cam block surfaces sized and shaped to engage the frame wall surfaces to absorb the forces and energy of the barrel when barrel movement is arrested by engagement of cam block surfaces against frame cavity walls;
• c) a trigger trunnion having a curved upper surface;
• and
• d) a journal surface on the cam block shaped to prevent the trunnion from moving upward.

In an automatic firearm having a frame, a barrel assembly having a forward barrel portion and a rear chamber member portion with a lower surface, a reciprocating slide, a guide rod, a slide stop pin and a trigger, the improvement comprising

• a) first cam surface means on the lower surface of the barrel chamber member including at least one cam surface;
• b) a cavity having an upper portion and a lower portion in the frame;
• c) a cam block on the rearward end of the guide rod positioned in the upper portion of the cavity;
• d) second cam surface means on the upper surface of the cam block including at least one cam surface, said second cam means engageable with the first cam means when the slide reciprocates rearwardly;
• and
• e) trigger trunnion means connected to the trigger which trunnion means is positioned in the lower portion of the cavity between the cam block means and the frame,
• whereby upon firing of the firearm the slide moves rearwardly causing engagement of first and second cam means which rotates the barrel assembly to cause the chamber member to be lowered.