Welcome, those are sweet Chi-coms!
$650 might be a little high depending on what you have there. I looked at the pics but a shot of the top of the receiver cover and a close up of the left side of the receiver as well as any cartouches around the cross bolt in the stock would help. I'm sure it's not unfired but it may well be original, it's kinda looking that way to me but can't say for sure.
The blued bayonet might not be original depending on year of manufacture but Outlaw and some others would know better than I. I'm just giving some quick thoughts, once you get all of the necessary pics up the real experts can tell you a whole lot more.
