Hello fellow enthusiasts I need your wisdom concerning a Glock 21 that I have. I am thinking about selling it for a new USP9. The g21 has 500 rounds through it, trijicon ns, 3 ten rounders, with tupperware. It has the finger grooves and accessory rail. The gun is in excellent condition. So if I was to trade it in at my local gun shop toward a new USP9 with reg sights how much do think I can get? What would be the difference I would have to make up? How much could I get if I just sold it to a private party then used that cash for the USP9? Thanks in advance
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