Yeah, I had one of those too and it was really a piece of junk. Lots of fiddly little screws that won't stay put, and pretty flimsy too. I had it on a Diana 54, and after about 100 or so shots it blew one of the caps right off. I replaced it with a Beeman 5039 and so far haven't had one problem. I also have a Leupold 3-9x33EFR in a 5039 mounted on an R-10, absolutely no problems.