Graybeard, thanks for your response. The company that made these EATON Supply, no longer makes them. As for a little history, I ended up with it because my nephew knew that I had a 10/22 and some one had passed it along to him. I don't believe it has ever been used from appearance and from searching the web I see that some have wanted them but they were not selling after the hi-capacity ban was in effect. Not much more to be found so that is why I posted it here in rimfire hoping that someone could come up with an idea what it might be worth.