Ok so i have my system for sale on CL, the four infinity twelves, and the amp, its worth around 300-350. A guy just offered me a Mossberg 535 w/ ghost ring, ar15 collapsible stock, and it has been ceramic coated olive green. Is this a good deal? I dont know how guns depreciate or anything. I mean new the gun is 500 from gander mtn. Just looking for advice. And is anyone familiar with Indiana transfer of gun ownership stuff?