I have a couple of scuba tanks and a pump. Tanks collected dust for several years but a dive shop opened up locally a few months ago so I got them serviced and back in use when I bought this rifle. I still have an Evanix AR6 Renegade PCP that I got back in 2009 that I had originally bought the tanks for but any nearby to home scuba shops went away and it got to be an expensive pain in the rear to have to drive too far to get air.