BLACKHAWK CQC SERPA Holster With Belt and Paddle Attachment, Fits Glock 21, S&W MP, Right Hand, Black 410513BK-R Featuring their patented SERPA Auto-Lock(TM) technology" the SERPA CQC Concealment Holster delivers a smooth draw" easy re-holster and unparalleled handgun security in a sleek package that is perfect for concealed carry. Features a passive retention detent adjustment screw. Rapid draw" target acquisition and reholstering are improved with the speed-cut design of the holster. They fit Shoulder" S.T.R.I.K.E." Quick Disconnect and Tactical Holster Platforms.