Blowback bb guns simulate the blowback effect that real firearms exhibit when fired. The result is that a blowback BB gun feels more like firing an actual firearm as with each shot the gun will blowback the top slide and chamber a new round. Many air gun enthusiasts appreciate the increased realism that blowback pellet guns offer.
For a realistic experience you may want to consider one of the following blowback guns as they are designed to have the feel and effect of firing traditional pistols and firearms.