I have a few. They are very fun just to shit around with ,but some of the rifles can, and are used for paintball-like games, but more mil-sim. They do have some power, but not enough to kill ( at least most of em ). An HFC M-16A2 has enough power to punch a clean hole in paper at 120', and the Sunproject M40 could do this at about 150', both in stock form. Usually, if you get hit with the pellet, it leaves a little red welt, and feels like a bee-sting. The guns come in every variety, shape, size, and model, with tons of accessories. You could even make a replica of an AR-15 if you have one!