It's going to be hard to find a $1,500 large frame AR that can hold minute of angle out to distance. I'd consider waiting or doing some spring cleaning and get up to the $2,000 budget for a Seekins SP-10, Daniel Defense, or POF Revolution. There was an everyday sniper podcast where he was talking about a LEO dept that was using POF Revolutions and holding sub-minute accuracy out to 600 yds, which if that's true is amazing.