I *think* I have most things figured out. The one thing I don't know is if the gas port on the upper is sized correctly. It seems some of them aren't from Aero... So, I may end up having to pull the upper apart if it is undergassed.

I've got a solid plan for the buffer system:
A5 length buffer tube 
Tubbs rifle length spring 
Odinworks heavy adjustable carbine length buffer 

I am going to spend the money on a set of go and no go headspace gages. I'm not playing around with 308 being out of spec. That gets into big oof territory if that is wonky.