If you're just looking for a realistic CO2 pistol and don't need a firearm clone to have fun, the Umarex 9XP is the one to get. It has the same blowback action of the firearm-branded guns but without the sticker shock. Umarex is the master of lookalike air guns, and the 9XP is no exception. The easy-to-load removable BB magazine holds 20 rounds, and the CO2 is placed inside the grip -- separate from the mag. That makes it much cheaper to buy lots of extra mags and load up before you hit the range.