Cartrige/Shell for Marushin Shell Ejecting Gas Blowback Airsoft 1911 Pistols

Update: The Fusion360 .f3d file is now uploaded in case you need to make your own tweaks. ====================================================================== Version 2 is now uploaded; it includes an O-ring groove and some improved internal geometry for smoother airflow. I don't know which size o-ring will fit, but you can always go with a DIY RTV silicone ring like the yo-yo community uses. ====================================================================== A friend of a friend picked up an older Marushin 1911 with the shell ejecting feature, it's neat but the shells themselves are discontinued. I modeled this off of an original shell to create a simple design that could be used for spares. This should help people who plan to use these Marushin shell ejecting airsoft pistols in a field environment, as shells printed in PLA will be cheap to replace and will bio-degrade if lost or forgotten. You won't have to spend an hour picking shells out of the grass, or s