There are almost more AR assemblers than Carter has liver pills! So you have to look at a few items. How much of the gun do you want the name brand to actually manufacture? Many are assembled utilizing components from many sources. I would look at Stag Arms and Windham Weaponry. There is also Core 15 which makes a sweet rifle. Colt is good but you will pay a premium for the name. Smith and Wesson is good as is one of if not the oldest manufacturer, Armalite. Rock River gets very good reviews as does DPMS. Is your head about to explode yet? My next one is going to be a Stag Model 8 as I like the piston driven action. Also, if you are a lefty Stag makes left hand models also. Good luck and have fun looking!