Air. Cuz like dead puppies, unless you have plenty of AIR PCP's are not much fun. Hunting for air as more and more airsoft and sporting goods stores are shutting down blows, never mind hand pumping unless you're really energetic. Get a nice air pump and a tank and you will have more fun with a Zelos, being able test pellets and tune to hearts content and learn the sport, than buying an expensive gun and having "AIR-ANXIETY". With relatively cheap reliable pumps like GX with an extended warranty from amazon and a buddy bottle almost ANY current regulated cheap OR expensive
pcp is best brand.
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