2nd the sheriffs badge. i use it on both my commando and my assassin. its just great.
ill be using one on my siren once i progress to lynchwood
also, i hate to say it, but an infinity.
limited ammo supply means that these things are invaluable as a backup tool. especially when soloing raid bosses. its unfortunate that nobody but the zerker has any options for bullet regen in this game --- Crazy? Crazy with low prices on Wind Brahmin. You buy one!!