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I get about two good mags of shots out of one gas fill on a hot day with my KSC G19 (upgraded metal slide/barrel, enhanced recoil spring, enhanced hammer spring, metal mag catch, 6.04mm tightbore). Of course, I don't have hi-flow valves installed in my mags (pfft, for 6 mags, that'd be expensive!), which MIGHT be what your's has if it's acting like that, unless there is a slow leak or something (am assuming you are filling the mag with gas properly, so I won't bring it up). Those let more gas pass into the system to give higher fps and kick, meanwhile your gas endurance goes down.
Velocity, I think I chronied about 305fps last year with 0.20g on a warm day using propane, and this year after installing a tightbore I got 341fps a couple times in the same kinda temp.
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