Congratulations. You just stole an $800 gun. BTW, I agree with those above who say they shoot the M18 better than the M17. There's just something about it that makes it seem easier to hold my sight picture.
I got my 18-3 a couple months ago.... $750 appears unfired w/orig. box... Got it home and cleaned and inspected and realized I probly shouldnt be shooting an unfired 40 year old gun...