Mount looks like a Burris PEPR.
The Burris PEPR, SWFA, and "FM" all use an identical 6061 aluminum extrusion for their scope mounts. All are made in China and I strongly suspect that all are made in the same manufacturing plant but made to different final machining specs as called out by their respective wholesalers contracts.
The FM has rails on both sides and top rings...
The Burris retains the top rings but machines off the side rails...
The SWFA machines off all top and side rails buts provides a single top rail cap to interchange with one of the non rail ring caps. A nice option.
However the mount extrusion, mounting hardware, tube centerline height, and ring screw patterns are identical.
Of the three the FM is the least expensive by over $20-$30...the Burris the most expensive...but the SWFA is the lightest and cleanest configuration of the three with the added versatility to go with or without the accessory rail. It's a good cost effective mount.