Whats the best ar (lightweight, mid length, M4) for a one and only do all rifle. I have a XD9 for self/home def. so itll mainly be a fun gun and "i have one simply because i can" rifle. No anwers invoving the purchase of more than 1 rifle, im broke and will continue to be broke for an additional four years. Side note; you have no idea how much this site has eased my stress during classes, thanks for everything guys!