Too many cheap beers (in cans) in the house that would be more fun to empty into the backyard than actually drink. More varieties of air pistols than I was expecting. CO2, pump and spring. CO2 seems the most popular, but I prefer not to have yet another item (CO2 canisters) to run out of and manage. Not many pumps. Spring (Airsofts seem to run on battery, do they all?) is an option, but charging a battery is only fractionally better than having to be on the ball with CO2 canisters. So are there any pump pistols worth their salt? Any spring pistols that don't require a battery to operate? Would either model have the power to penetrate a full can of beer from 20-30 yards? Obviously (low) cost is a major selling point, too.