If you regulate it down and only charge the mag to ~125psi, it will hold fine, but expect 1, maybe 2 shots from it. Propane is stored in liquid form in the mag, while the vapour on top is what's being discharged to fire the bb. Charge a mag with straight vapour (gas can right side up) and you'll simulate it being charged with regulated co2/hpa/any compressible gas (that's not oxygen)
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