A pistol-to-
rifle conversion kit includes a
rifle body that includes a lower
receiver, which includes a grip mounting portion, which is rearwardly adjacent to a trigger guard, which is rearwardly adjacent to a
magazine well receiving portion, an auxiliary trigger sliding mounted in the
rifle body and including an elongate member and a forward trigger interface member, which extends from a forward portion of the elongate member and which is configured to interface with a trigger of a pistol mounted in the rifle body, and a trigger member which extends from the elongate member for directly contacting a shooter's finger, and one or more of the following in any combination thereof: an ambidextrous rifle body quick-lock
fastener, an ambidextrous
magazine release button, an ambidextrous safety selector, and an assault-rifle-style charging
handle.