I have a DPMS SASS .308 that is an awesome long range rifle - .5 MOA with good ammo, 1 MOA with reloaded pulled mil spec (good but not great bullets). Has all the trick parts already on it. Unpack, clean, load, and shoot. A bit heavy due to the heavy barrel profile, but an awesome rifle.
I also have a M&P AR-15 rifle, not sure of the model number but it also has all the trick parts, works well, and is a MOA rifle out to 200 yards (longest range around here). Never a problem with function or quality.
I looked at both the .223 and .304 AR platforms pretty extensively before purchase and both of these had the features and quality I was looking for. Look around, pricing varies by 2-300 between vendors.
Have fun, Buy Both For Maximum Enjoyment!
Then it's MOA at all ranges. Just sayin'.