A holster assembly for a firearm includes a shroud (20, 92, 168) with a muzzle receiving space (31), a firearm holding member (100, 174, 246) and a bias activating assembly mounted in the shroud (20, 92, 168) for biasing the firearm into a stowed position against the holding member (100, 174, 246). A hood enclosure (166) is movable between open and closed positions. The hood enclosure (166) includes a pair of guide slots (188) within the shroud (20, 92, 168), a pivot pin (182) and a guide pin (186). The hood enclosure (166) may include an illumination device (238) mounted to the firearm, a hip mount platform (256) to mount a hip mount assembly (34), or a secondary stowage mount (270) to attach a magazine carrier (278), expandable baton carrier (266), etc. The shroud (20, 92, 168) includes a detent (178) that receives a locking safety lever (146) of the firearm. An L-shaped slot (138, 106, 162) receives a projection from a handle portion (132), a take down button (88), a safety lever (158), or another side extending projection of the firearm.