This scope came on a rifle I bought, and I replaced the scope with a better one. Been trying to sell it for a while, and since it is generic no one wants it. So I decided to see if it would fit on my Ruger. There is room for a sheet of paper between the barrel and scope, perfect. I have never shot this pistol as well as the other 22/45, but that may be a hand fitment thing. This will be shot from bags (err phone books), something I have never done before, but I think that will minimize the hand fitment & stability thing. And no this isn't permanent. Planning to put a Mueller Quick Shot on it when I get the nerve to spend the money. I actually sold the scope to a guy at the range lol. Eye relief was horrible, but manageable at 6-12x magnification. Best 5 shot group can be covered with a dime. These are all 28 bullseyes I shot after zeroing the scope on another piece of paper. I did made a few minor adjustments on the first few, but nothing substantial (1/4 moa at 25 yards is a tiny amount). The very last one was shot rapid fire. To be fair, there wasn't much recoil.