Abstract: Disclosed is a slide stop assembly for a handgun including a slide stop pivotal from an inoperative position into a position engaging the slide when the latter is in a recoiled position. A generally flat, shallow V-shaped, side plate is secured along one side of the frame against rotation or rocking movement. The securement is effected by engagement of the side plate at spaced points therealong with the respective hammer and sear pins of the handgun. One leg of the side plate extends forwardly and terminates in a tab. A spring biased plunger on the slide stop engages the tab to preclude inadvertent pivoting of the slide stop from its inoperative detented position into its slide stop position.