Alright, I brought one of my friends out to shoot my GSG-5 and he was hooked. He even offered to trade me his DPMS M4 for it And then he offered his glock 23 and beretta 96. Well I offered that I might be willing to buy his glock 23. Not being a fan of glocks, I don't really know how much they go for. So here's my question: how much should I offer him for a gen 2 glock 23 with some holster wear?