The Apocalypse™ 2K™ is a single stage regulator; Micro Precision™ machined from a solid block of the toughest FAA approved "certified" Aircraft/Aerospace grade aluminum. Designed to accept input pressures up to 4500PSI and output pressure within the 200 to 1000 PSI range, the Apocalypse™ 2K™ is totally compatible with virtually all Paintball markers. The Apocalypse™ 2K™ features include; the Air America® Limited Lifetime Warranty, tournament-level field maintenance, internally integrated on-off control, multiple input and output pressure safeties, ambidextrous input/output hose and gauge positioning, on-marker system fractional slide rail adjustment, severe service; "Made in the USA," input and output gauges and a Military, Airline and Space program approved D.O.T. (United States Department of Transportation) approved composite wrapped pressure vessel.
The Air America Apocalypse 2K Air System is older, so while it may be available used and in a few cases new, it is not commonly available anymore.
This tank is lighter than the older ones because the reg is now made of aluminum instead of steel. Has a good recharge rate. You don't need a drop to use this tank either.
The on and off valve is hard to open or close when the tank is filled to 2500 PSI. More like a pain in the fingers
This is no cheap HPA. I believe it is worth the money if you can afford it. All in all it is a good tank and a good company. All I can say it is more reliable than an Angel Air out of the box(seen 3 brand new Airs leak out of the box)