If you fill the mags, just use a little bit. Basically just a tap against the fill valve, less than a second. However, since CO2 is not, and doesn't need lubrication like Green Gas, it doesn't make much of a difference. I simply leave mine empty and occasionally remove the valves to lube the o-rings.
Also, GHK's gas valves aren't as leak-proof as their CO2 ones. The gasket on the CO2 valve is made of (something?) that seals much nicer than the GG valves. I assume that the rubber on the GG valve probably gets ruined over time from so much temperature change constantly.
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I own more GBB guns than AEGs, because I'm a stubborn bastard who hates doing things the easy way.
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