I use green gas / propane in mine, with TM mags.
Only thing I have to note is that using green gas (and an upgraded outer barrel with a compensator) required me to get an upgraded hammer spring which I did.
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VFC HK416C Crushed Orchid - VFC SR16 BCM ZTW
TM G17 Loki Tactical Pink - TM G19 TTI Combat Master
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