ctrl+A
Delete.
Seriously, though, I don't think there's really an "easy" way. Are you trying to just replace them with new weapons, or do away with a weapon-oriented game completely? There's a lot of inventory management stuff in there that we probably should have made use of, but Calrathan wasn't familiar with the code base when he whipped the first version of Paintball 2 together, so he pretty much wrote his own stuff.