I have shot the FDE Sig that comes with a rail, mag well, nice grips and sights for suppressor use all for $1,000. They have one in stock at Bullseye in Lawrenceville. They are very nice hosts.
Accurate Ordnance in Winder, all the way. Perfect alignment and seamless look are the only way they do it. Look at their website and see some examples of their work. I have had many rifles threaded there and everyone was perfect. Plus, they do great cerakote refinishing and can work miracles...