That quad rail looks like it is $$$$$$$$$$. I have a AR that I built off a Bushmaster receiver and love it to death. I bought the cheap replacement handgaurds with the rails built in on the top on bottom, and put a forward grip. I have yet to get the stock since the band drop but will someday. I reload for mine and can't keep up with my shooting habbits. I have been buying used GI mags at gunshows for about $10 so I now have about 9 that are in 100% working order. Are you planing to mount a red dot or a scope or just leave the handle on? JPB