Bought this HK91 today from a young guy who was obviously down on his luck and supposedly selling his grandfathers HK91 that he'd received as a gift. He listed in on my local classifieds for an insane $750 and I paid $900 after outbidding someone else for it. I don't know too much about G3's other than that theres no way in hell it should be selling for $750, so of course I picked it up. The roll marks seem genuine, and from what I can tell it seems real to me. What are your guy's thoughts? How well did I do, or am I an idiot that bought a fake?