I had no idea. I thought WE usually copied Western Arms and such. It makes sense though, Tokyo Marui makes the only PX-4 worth writing home about.
As for the Marui pistols, as of a couple of years ago they were all set up to run on HFC (duster gas); however, the PX-4 is supposed to be green gas ready. I'm with Hectic and Drake, I think your issue is elsewhere.
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