I want to purchase a 16" upper with a mid-length FSB. Not super concerned about accuracy as long as its 5moa or better. I don't want to spend more than a brand new PSA or Aero unless it has certain features.

For a plain upper no CH or BCG, I wouldn't want to spend over $200-$250.

With a CH and BCG, I'd be more comfortable up to 350 or so.

Complete rifle, would not go over 500.

I am not interested in any aftermarket upgrades beyond a DD A1.5 rear sight, a Magpul CTR stock, a Magpul MOE grip, and a drop-in or free float rail. Sling, QDs, etc I have already. I'd go up in price for these, but I don't want a cheap red dot or obscure hunting scope.