I saw a really cool conversion kit for just a plain ol Ruger 10/22.
made by Achangel, I believe.
I've really been eyeing a 22. shot my XD the other day, and picked up a box of 100 .22lr, and rented this little revolver....fun as crap to shoot. and cheap enough to shoot all day. I'd like to get a .22 rifle too for some fun plinking.