HamburgerFPS shows his 3D printed SMG Kit for the Hi-Capa Gas Blowback. This kit, specifically designed for the Hi Capa 5.1 and MEU (rail version), has been successfully tested with both TM Hi Capa and KJW (KP 05, 07, 08, 11) without encountering any issues. It's important to note that the dimensions of the dish head screws include the head, unlike the Socket Head Cap Screw dimensions. Furthermore, all these dimensions follow the metric system.

Carson McGarry posted his Spartan Airsoft SMG Kit which you can put together when you buy it as his Etsy store... "The Spartan SMG airsoft gun is one of my finest creations. It bridges the world of fantasy to real life. I've designed this airsoft gun to work with a Version III Ak gearbox. Each part is ready for 3D printing and can be purchased at Etsy.