The high pressure big bore air rifles are not quiet when fired, so you're not going to keep the neighbors happy in a suburban subdivision.
There are bicycle-type hand pumps that can recharge the onboard air tanks of these rifles, but you'll get quite the workout between strings of shots. Most rifles in this class are recharged from scuba tanks, and you get your tanks refilled by the local Dive Shop.
Depending on model, you get around 10 shots per charge.
any idea how much a tank refill is?