For the folks who don't want to spend a lot on "airsoft" and just want to practice backyard plinking and shooting techniques Umarex makes a few pellet guns that are realistic and are CO2 operated with the twelve gram cartridge. I have a .177 cal Berreta PX4 Storm that has the blowback function 16 round magazine and is almost identical in weight as the real thing. The balance of it may be a little different but it works as a training tool. :thumsup
Here's their link: http://www.umarexusa.com/default.aspx
Here's their link: http://www.umarexusa.com/default.aspx