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i've been using my USPc with green (propane) as well, with no propane related issues, aside from blowing a gasket or a seal or something once (was apparently easily fixed, you'd have to ask Kwokwai how he fixed it). Put a large number of rounds through it (probably close to 8k now), and so long as you lube it, life is happy. Great pistol, though I will admit to having a few issues (triggers being one).
Anyhow, just remember to lube, and I'd recommend getting a metal slide/outer barrel, as well as an upgraded recoil spring to avoid damage to the frame.
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