Abstract: A holster (10) includes one or more modular inserts (90, 100) positioned within a rigid body (20) of the holster (10) to fit and position a preselected handgun (56) or group of similar handguns or other service items. Also described are security devices including a pivoting security hood (66) and an internal handgun retention device that engages an ejection port (136) of the handgun. The hood (66) and internal retention device may be both opened by a common release lever (70) of the holster (10) that is preferably located along a portion of the holster (10) substantially adjacent a user wearing the holster (10). The release lever (70) drives a rocking latch located along a front wall of the holster body (20), which latches the hood (66) in the closed position and engages an ejection port (136) of a holstered handgun (56).