A handgun holster permits sideward extraction of the weapon, and engages with the central portions of the handgun without regard to accessories mounted to the front or beneath the barrel. The holster has a main element which engages the central region of the pistol in a snap fit between two opposed arms. Lateral projections extend from the back wall to restrict the side-to-side displacement of the gun and two resilient flaps extend around the engaged gun, providing additional retention, and covering the on/off switch of any flashlight accessory. The main element is connected to a mounting assembly to permit the main element to be set at any desired angular orientation with respect to the mounting assembly. The mounting assembly has two expandable parts with opposed flanges which permit mounting to either a conventional belt, or to a series of webbing pockets, such as in the military's PALS webbing attachment system.