Left to right...
AR#1: Smith & Wesson M&P Sport 2, 16" barrel with carbine length gas system. Magpul BUIS rear sight, Hogue pistol grip, standard mil spec trigger (actually a nice one too), Magpul carbine length hand guard, green nylon GI WEB sling.
AR#2: Rock River Arms complete 16" upper with mid-length gas system (gas block is on same plane as upper pic rail), and Magpul mid length hand guard. Magpul BUIS rear sight. Midwest Industries steel folding front sight.
Palmetto State Armory complete lower. Magpul pistol grip and Magpul "enhanced" winter trigger guard. Standard mil spec trigger...which REALLY blows and will be swapped out.
Black nylon GI WEB sling.
AR #3: Palmetto State Armory complete free float upper 20" barrel with rifle length gas sytem. Vortex Strikefire 2 red dot optic (for now), Harris 6-9" bipod.
Rock River complete lower with A2 stock, standard milspec trigger (which actually seems pretty decent), Hogue pistol grip, winter trigger guard.
I plan on a Nikon P-223 3-9x40 scope and M233 mount, and a green cotton GI web sling.
I just pinned this mess together. It's a nuthin' fancy budget musket. Haven't had a chance to fire it yet.
PSA shipped this upper to me (#3) and "forgot" to pin the gas tube to the gas block. This fact really and truly pissed me off. I got a roll pin a couple of weeks later from them and installed it myself.
If you're gonna purchase from PSA, look your stuff over very close. Apparently, they have a history of doing shit like this.
Like they say...if you want something done right, do it yourself.
If I ever get another AR, I will assemble it myself.