Abstract: The present invention discloses a holster for a semiautomatic handgun. The semiautomatic handgun comprises a slider, a spring, a barrel terminating in a mouth, a hollow butt for a magazine clip and a firing mechanism comprising a trigger coupled to a hammer by a mechanism. The holster comprises left and right walls connected by a back piece. The holster is opened at its proximal end for insertion and removal of the semiautomatic handgun thereby and has an opening at its distal end. The holster further comprises means for engaging the slider of the semiautomatic handgun as the handgun is pushed into the holster, to slide the slider with respect to the barrel, thereby chambering a round.