I have a guy wanting to sell his AR, a RRA with a 14 1/2 chrome lined barrel, flat top and collapsible but stock. With 5 steel 30 rd mags and 1000 rounds of ammo, cheap brand can't remember exactly. He bought the rifle new a year ago, fired less than a full mag through it. It also has the detachable carry handle. What would be a fair price, I was thinking 900. Am I way too low?