You are right, they did come in .22 long rifle, but also they made one in .32 Magnum for a few years. For $75.00 I'd like to get one of each. So far it likes 3.0grs. of 231 under a 148gr. double ended wadcutter. Cheap entertainment, and I can hit pretty good with it too. Probably that's all I'll shoot in it.

Next time I'm on my way to Nashville, I'll swing by your place and drop it off, and you can fool with the screws. Heck your retired, you probably need something to fool with anyway. The screw heads are really soft on this thing. I'm not sure but that I might have to drill them out. One more thing, the gun's trigger is supposed to be adjustable, but I haven't figured that out yet.

I have used that method with very good success. I used a vise and clamped them in with a piece of leather to avoid messing up the threads. Use a light ball peen hammer and nice even light strikes. No heavy handed stuff. Just keep pushing that metal where you want it. You can then finish it off with emery wrapped around a file and the screw in a drill too act as a simple lathe. Polish and cold blue, or if you are tempted, fire blue them. A thin swiss file works well to adjust the slot if needed.