I have a line on this rifle and scope that seems like a good deal. I found more information on the rifle, the scope seems to have different options. I may need to act fast on this opportunity. Any advice or experiences when looking over and negotiating?

I am selling my Remington 700 SPS Tactical .308 caliber. It has a 20 inch heavy contour barrel, x-mark pro trigger, and a 3x9x42 SWFA SS mil dot matte Scope. I am selling the rifle for $500 obo and the scope for $150. I have fired under 100 rounds through this rifle.