Algodoo

ngphil did a great job on showing the major three types of firearm operations (Blowback, Recoil, and Gas), and I know how difficult it is to simulate the gas operated version because of how difficult it is to simulate a flowing gas. Although he did the best he can, his mechanical emulation of a gas operated firearm is confusing at best (in my opinion). Even for someone like myself who has a very good understanding of how most firearms operate, the gas version of his tutorial really doesn't represent how the action functions in a real firearm (sorry Phil, no offense intended. You ARE the best firearm maker on Algobox!). And so, by using the magic of Thyme scripting, I tried my best to simulate a gas operated firearm (Rifle). It's not perfect, but I believe that it closely simulates how the gas from the exploding cartridge gets diverted from the barrel to actuate a piston which causes all the mechanical motion to happen which pulls the spent cartridge case out of the breech and replaces it with another one ready to fire again (In this simulation, there is only ONE live cartridge to fire).

Leave comments if you have questions about how this works.

UPDATE: Turned gravity ON so that the cartridge case falls to the ground.