I read lots of info, and researched hopefully enough, and came up with this for my first AR. I built it from pieces, the furniture is all magpul, the upper is a 16" w// midlength gas system and a low profile gas block under the rifle length free float quad rail. The upper and lower are both rock river, it took WAY too long (a bit over 4 months) to get the specifically ordered upper from rock river, but it turned out exactly like it wanted it so I guess i'm OK with that. It has a 3lb timney trigger and a 2MOA aimpoint red dot on top. I still need to get some sling attach points, the stock has the QD points, and I need a rail mounted version for the front still because I don't like the sling as its shown in the picture. Haven't shot it yet, it hasn't been together for 24hrs yet and work has gotten in the way so far. The biggest "problem" is that it made me want to build another one!