I'm wanting to purchase one of these AR's for my wife for Christmas, I'm not sure of the better one of the three or where to purchase from at a fair deal all are sold out that I find. She also wants a rail that covers the gas block but most of the one's I saw has the front sight post how can i pull that off with out seeing the notches where the pins that held the sight post on I'm open for leads,links ect for low pro gas blocks and a cool rail. If any of you guys have any of these set ups please post pics to help me with ideas.