Dummy Co2 12g

During COVID lockdown I wanted to be able to practice reloading but I didn't want to use a real cartridge just so that I don't wear out the seal prematurely. Reloading without the cartridge is annoying.

I measured a Crossman 12g cartridge and I designed this to rest on the magazine frame instead of the seal to reduce wear during practice. I'm using a KJW KP-07 1911. I only have the one so I can't say for sure it will fit any CO2 mag so feel free to test it and leave a note! It might depend on how the mag is designed around the seal.