I was dumb - Norotos PVS-15/18/21 Dovetail Adapter

I didn't do any research. I just googled for an adapter that would convert a standard issue norotos Rhino Swing Arm from the 'bayonet' style J-arm to a dove-tail. Unfortunately, this isn't the right part for that. The side that interfaces with the Rhino mount would have to be two circular holes, not interface pictured above. This adapter is meant for a Norotos Rhino II. So, if you have the standard Army-issued mount, like I do, it will not work. It's totally my fault, and otherwise, the adapter seems very well built/rugged, hence my positive rating. I'm going to hold onto it because it's not worth going through the process of returning, and I might have a use for it or a buddy that does, one day.