The invention relates to a pistol having a barrel slide (2), which is guided displaceably in a longitudinal direction on a housing (1), and having a locking device (10), which has a head (22) of the barrel (3), has a locking block (20) fixed in the longitudinal direction, and has a pair of locking bodies (24, 25) guided in a transverse groove (23) of the head (22). To reduce the peak values of the local surface pressure in the parts of the locking device (10), the locking block (20) has two first wedge surface (21) which are symmetrical with respect to the longitudinal central plane; and the locking bodies (24, 25) are cylinders, the lateral surface of which has two parallel planar guide surfaces (35, 36) which fit in the transverse groove (23), has a second wedge surface (38) facing toward the respective other locking body (25, 24), and has an engagement surface (40) which faces away from the respective other locking body (25, 24) and which is designed for engaging into the respective recess (27) of the barrel slide (2).