A look at the Jing Gong Colt 3330 Gas Blowback Pistol that is available at Tanie Militaria... "A pistol replica from Golden Eagle powered by green gas. Most of the replica is made of metal - such elements as the skeleton, slide, outer barrel or the magazine are made of metal. Only the ergonomic grips are made of plastic - just like in the original flammable.

The pistol has a double safety device that prevents accidental firing of a shot. Thanks to the realistic  blow-back system, the bolt of  the replica moves back with each shot, just like when firing a firearm. After emptying the magazine, the slide remains in the rear position.

The replica comes with a metal green gas magazine with 20 BBs."