I have never had good luck buying used guns. Also, I have a difficult time paying 90% or more for a used gun when compared to new. In fact, if I can't buy a used gun for at least half of what a new one would cost, I'd pay more and buy new. Depending on who you buy from, there can be legal risks associated with buying used guns from private sellers.
Supposedly, a gun is an item that can be easy to sell, and therefore a good investment. That might be true. But I'd rather pay 10% or even 25% more and get a new one. I've seen some warn-out looking Glocks for $400 +. I'd gladly pay another $100 and buy new.
Also, in the event I trade one of my guns in for a new gun at a gun dealer, I always come out on the short end of the stick. The dealer has his pitch that he can get them new at wholesale, so he can only offer used-wholesale. It's a loosing proposition if you ask me, but I've done it before just to get rid of something I no longer wanted.
In fact, there are certain risks involved when buying new, especially when ordering online. Don't mean to keep rambling on, but the last used gun I bought was a Chinese SKS from a seller on Gunbroker. It was a short-barrel paratrooper model that looked very good in the pictures. The seller said all the numbers matched. When I picked the SKS up at the local FFL, it did look nice. When I got it home and took it apart, the serial # on the bolt had been ground off and the bolt looked older and more warn than the rest of the gun, though all the other numbers matched. I could have called the sellers and complained, but I just sucked it up as another bad used gun buying experience.
With such competitive prices on new guns, there is no reason to buy used, in my opinion, especially at the prices they seem to bring these days.
To the OP, I hope you get a good price for your guns, and wish you the best of luck.