My buddy wants to sell his AR and I am considering buying it. I think I will, but I guess I was just looking for some advice. It is a Bushmaster model XM15-E2s, it is a 20" fluted barrel and free float hand guards, it is susposed to be all match, all I can say is it shoots great and the trigger feels great. He has had it for about 10 years, but he has only shot it two times(both with me) it has a grand total of 70 rounds through it. It looks like new and shoots great, and he only wants what he paid for it 10 years ago, $800. I should buy this right?