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My understanding is if it has a metal slide it should be fine on propane. It's the plastic slides that usually crack and break when running propane. My KWA (basically KSC without the trades) USP recently blew its recoil spring guide after 4000 rounds on propane but I believe that was due to a BB getting stuck in there. Everything else has been fine on propane. Just make sure you use the silicone oil with the propane adapter.
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JG HK416
KWA USP
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