Building your own is the way to go. Rock River has the best non-custom trigger you can put in. Any AR that uses mil spec parts will run alright. It's just what fits your needs/ wants.
Right now I have a RRA lower built from a parts kit with a bushmaster barrel on a DPMS upper. Been using the same optics for a while, aimpoint m3 in a cantilever mount in front of a 3x magnifier on a twist off mount.
"MEN WANTED FOR HAZARDOUS JOURNEY. SMALL WAGES, BITTER COLD, LONG MONTHS OF COMPLETE DARKNESS, CONSTANT DANGER, SAFE RETURN DOUBTFUL. HONOR AND RECOGNITION IN CASE OF SUCCESS."
Ernest Shackleton’s ad placed in the London papers, recruiting members for his
1912 Imperial Trans-Antarctic Expedition.