I have three PCP air rifles, have condor .22, a custom .308, and a Benjamin maurader. I do have a HP hand pump for back up but use a couple scuba tanks. To fill my tanks I bought a HP air pump called a shoebox compressor.......hooj it up to a 100psi compressor and it puts out to 4500psi.......my 308 shoots a 171gr. Bullet off of 4500psi......they are really nice to play with, the condor is suppressed due to sounding like a 22 rimfire....