Nice, you are 190 in for a very nice complete pistol lower. Not a bad deal. Will keep an eye out for a barrel for you as I am also looking for a 10.5” 9mm barrel (hybrid for colt lowers) and they are out of stock. Ordered a magwell adapter from midway on Monday and already have some mags from a yard sale...
As for sights I have the Sig Romeo 5 on my 10.5” which is a nice red dot with looong battery life and auto start/shutoff. PSA has it in stock for 119 and another deal at 199 plus ten magpul mags. Feel like a PSA spokesman but i cant argue their deals...