Disclosed is a grip assembly having a pair of side grips and a heel grip. Each side grip has a plurality of inwardly directed projections arranged to conform to the outline of an opening in the frame. Forwardmost projections of the side grips are undercut to lock the forward edges of the side grips to the frame in final assembly. The remaining projections bear against the margin of the frame opening to prevent shifting movement of the side grips in a plane parallel to the plane containing the handgun. The side grips also carry undercut inwardly directed projections adjacent their rear edges. The heel grip includes a leaf spring, the opposite lateral ends of which engage the undercut rear projections of the side grips in final assembly to lock the rear edges of the side grips against movement laterally outwardly of said frame. The heel grip is secured to the frame by a pin inserted through the frame and heel grip adjacent the lower end of the heel grip.