The BM-12 mount was designed to be a simple way to add a light (or other accessory) to your Saiga 12 or VEPR 12 shotgun. Well, it does just that. Here's what I think of it overall….
-Simple design. KISS principle is hard at work here.
-Lightweight----weighs in at 1.05oz
-Anodized 6061-T6 aluminum.
-1913 spec rail with 4 slots so it'll accept a wide variety of lights/accessories.
-MSRP is $60. Some folks think it is high but compared to other mounts out there I think it's pretty reasonable.
Here a video with some shooting, how the mount works, and what I think of it overall: