This is a BLACKHAWK Belt Holster known as the CQC, model 410503BK-L.
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" and a speed-cut design for rapid draw" target acquisition and re-holstering.
Features:
Includes Belt Loop Platform and Paddle Platform
Fits Shoulder, S.T.R.I.K.E., Quick Disconnect and Tactical Holster Platforms
Distinctive and unique L shaped button
Left hand
Fits Colt Gov't 1911 and most clones with or without std rail