10/22 though it will cost about 200 bucks. There is no 22 better in my eyes. i was shooting a monster can at the range the other day 100 yards 10 for 10. And mine is stock with a cheap bsa scope. You can change barrel, stock, make it a gatlin type gun, heck i saw a 2k kit to make it look just like a SAW. I am not sure anything in the world can be customized in so many ways.