C02 Gas Airsoft Grenade Charger Cap

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A buddy requested I craft and print a few caps to keep dirt out of his CO2 gas refill devices - and prevent them from discharging while in his pocket. I took some measurements of the device, which takes a standard 12g CO2 capsule and has a simple valve and pressure gauge, and designed this straightforward cap (with a few added dimples to give it a more authentic look). The Cap features a hole for inserting paracord or similar (4mm diameter) to allow the cap to be tied to the charger device. There are numerous versions available from various manufacturers, but the product I based my design on is this one: https://airsoftpro.cz/en/airsoft-guns/sniper-rifles/other-grenades/co2-plnicka-airsoftovych-granatu-s-manometrem-detail