Algodoo

Hmmm.... Interesting. In my opinion this scene does not really show how GBB pistols work. There is no true firing pin in GBBs, but a knocker that depresses a valve in the magazine, filling up the nozzle and pushing back the slide. I'm sure you know all this, but currently, the scene does not show much of that. I'm sure the final version will fully explain the principles of GBBs.

Actually I have very little knowledge of how they actually work, I was just assuming how they work. If you have any schematics or anything that shows how they work that would be very helpful! I'll start researching the mechanism tonight

Haha! Redwolfairsoft has good explanations of GBB mechanics. They are actually quite elegant in design.

The magazine contains the BB pellets and the gas, in liquid form and under pressure. The flow of the gas is controlled by a large valve located on the back of the magazine. When depressed, the gas vents out a rubber gasket on top of the magazine.

The nozzle can be considered as the bolt of the gun. It is generally a hollow tube with one narrow end that fits in the barrel right in front of the chambered pellet and a wide end for a piston fixed in the slide. A large hole in the bottom facing the magazine well is the inlet for the gas. Assembled in the gun and with the magazine inserted, the nozzle is sealed on three ends: The wide end is sealed by the piston, the narrow one by a rocket valve, and the bottom hole by the magazine gasket. The nozzle slides freely from front to back.

The airsoft replica has a hammer or striker that actually does "fire" the pellet and create blowback. However, it does not strike a firing pin in the slide, but a spring loaded "knocker" in the frame. When the magazine is inserted into the grip of the pistol, the knocker is aligned with the main gas release valve on the magazine. The rubber gasket on top is firmly pressed against the gas inlet hole of the nozzle.

The moment the hammer is released and depresses the knocker, in turn pressing the main gas valve on the magazine, liquid gas in the magazine vaporises instantly, venting out inside of the nozzle via the gasket. The rocket valve is opened since it rests against the back of the BB, and allows a small dose of the gas to rush into the barrel, propelling the BB before closing and sealing the narrow end of the nozzle. As gas keeps expanding inside the nozzle, the piston connected to the slide moves back, starting the blowback process. The hammer gets pushed back by the slide and, with the magazine valve no longer depressed by it, the gas stops flowing. Now, inertia racks the slide back, slamming it into the frame, giving you the sensation of recoil. The nozzle springs back into the slide, allowing the next BB to pop up in its path. The recoil spring pushes the slide forward and a flange on the nozzle shoves the BB into the chamber.

That was quite a long and detailed explanation, and I hope this helps you. Pictures and diagrams may help.