Okay, I need some advice on a new M4 style rifle build. I have an extra lower receiver that is begging to be built, and the $265 DSA upper is calling my name. I've built 3 ARs, from standard kits before, nothing fancy. This time, I want to go a little "tacticool" with it and have some fun. I was thinking of getting a quad rail for it, and that's my first question. What are the advantages of having the style below, vs the normal one? Maybe not UTG but that style, any benefits? Next question, the stock. I'm thinking I want to go Magpul, either ACS or the CTR. Any good reviews on either? I'm looking for overall usefulness relating to price, and definite emphasis on FUNCTION. I'm gonna put a standard vertical foregrip, a flashlight, and a reddot (probably eotech) on it, but other than that...anything else I'm missing? I'm planning on standard lower parts kit, and I have an M16 bolt carrier already, so no need for one of those.