When selling a rifle, pistol, or shotgun I completely understand asking for proof of a resident state buyer, and also for a peek at someone's CHL. But why do so many sellers want a bill of sale? Bad enough, the hoops we already jump through without asking for something that's not required (YET!) Just very curious about so many ads that want the buyer to sign a bill of sale..... I am legal in every way, but the bill of sale thing sure backs me off a purchase.