Abstract: Unitary polymeric butt plate with an integral latch and catch mechanism is used for a magazine of a semi-automatic pistol. A frame of the pistol includes a handgrip defined by a backstrap, a front strap and laterally spaced side walls and a downwardly opening magazine chamber within the handgrip. A downwardly open slot provided through opposed side wall portions of said frame, one portion of a catch disposed within said frame and interengageable with another portion of said catch mechanism. The latch mechanism is adapted to interlock with a slot through opposed wall portions adjacent the lower end of the magazine. The catch includes a pair of spaced, opposed and resiliently flexible arms extending upwardly and outwardly in divergent relation from opposite side portions of the butt plate portion.

Abstract: An ergonomic semi-automatic handgun includes a pivotable trigger with a concave face portion disposed in front of the grip portion whereby when the trigger is pivoted, the center of the concave portion will travel in a generally straight line towards the base of the saddle parallel to the axis of the barrel and at an optimum distance from the barrel. A unitary polymeric frame including a semi-cylindrical front strap is disposed at predetermined angle relative to the barrel. A ridge and channel are formed on each side of the frame and are adapted to guide and retain the thumb and forefinger of a shooter in the appropriate position to hold, aim and fire the gun.