This is a BLACKHAWK Belt Holster known as the Omnivore L2 Multi-Fit Holster, model 419001BBR.
Multiple holsters for multiple handguns is no longer an issue. The Blackhawk(R) Omnivore(TM) is a multi-fit holster that accommodates more than 150 styles of semi-automatic handguns with an accessory rail. The active retention mechanism locks onto Blackhawk's proprietary Rail Attachment Device" not the frame of the handgun. A thumb release disengages the locking mechanism when drawing the handgun.
Features:
Level 2 Retention – Uses two features to hold handgun securely in place
Free-Floating Design – Holster locks onto Rail attachment Devise, doesn't wear firearm' frame and finish
3-Position Adjustable Release – Height of thumb-activated retention mechanism adjusts to fit your hand
Right hand
For Semi-Automatic Handguns with Surefire X300