A shoulder weapon carrier system comprising a shoulder stock (10) attached to a pistol (3), said stock (10) being releasably supported by means of a slide assembly (119) to a supporting box (167) on a user's belt. In a preferred embodiment, the shoulder weapon carrier system comprises: a pistol (3) comprising .gtoreq.frame and having a transverse slot at the bottom of the frame and transverse holes in the upper rear of the frame; a shoulder stock (10) comprising a stock body comprising a butt (31), a cross pin that is adapted for engagement with the transverse slot and studs that are adapted for engagement with the two transverse holes; a slide assembly (119) that is slidably mounted on said stock body, said slide assembly (119) comprising a slide tongue (131) having a slide hook; a supporting box (167) having an opening that is adapted for receiving said slide tongue (131).