I really appreciate a good piece of machine work like that, something that is so high quality, even if it isn't a full sized gun. I made something similar to yours out of a some oxygen tank parts and it is the same way, really nicely machined brass and it just looks really cool. I have a tiny BP revolver in .22 caliber and it's about the smallest practical BP revolver you could make and it is made like a Swiss watch, really neat stuff.