HELP! A co-worker is selling a Sig 220 .45, like new, only fired once, with 2 mags. When I asked how much his responce was "Make me an offer!" He also made a point of letting me know he paid $750 for it. He also let me know he took it back to the store he bought it from to make a trade and they told him we've got so many we're not interested. How much should I start at? What's the most I should offer before I walk? Thanks for any help in advance.rocko.