This is a Leapers, Inc. - UTG Mount, model RG-FL27MC.
This is a UTG M-Lok offset flashlight ring mount. It is low profile" 3.47" in length" and comes with two inserts to fit 27mm" 25.4mm (1") or 20mm flashlight tube diameters. Includes M-Lok steel locking nuts" screws and Allen wrench for user friendly installation.
Features:
Black finish
Fits M-Lok
Removable offset mount provides 1.83 forward or rearward offset;Rings 1.12 vertical or downward offset