I'm assuming it doesn't leak. Faulty fill valve not allowing it to actually fill completely perhaps? Also, are you actually filling full (to the point gas leaks out the fill valve) or are you just counting to 6 and releasing? On the mags you only get a few shots, does a bunch more gas come out than normal on the shots (a cloud or harder than usual kick)?
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JG HK416
KWA USP
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