At the Cross roads gun show today I found a magazine. At first I thought it was GI, marked HR-R. But the lug seems to be only half. It was marked 25.00, I offered him 20 andd he took it. I'll be trying it Monday at the range to see how well it works. I'm pretty sure it is GI, and will be good. Just the half lug that I haven't seen before. I forgot to ad this one side of the magazine has a cut out, seen in the picture added.