Advice for build

I'm wanting to build out a .308 rifle to dip my toe into longer range shooting. I've been trying to do some research on parts and pieces, but it seems like there are many variations of an "AR10" and some parts won't work with others and it's all kind of confusing. So.... I came here hoping to get some recommendations for build parts. I already have a stripped lower receiver and a stripped upper receiver from Palmetto State Armory. I think I want a 20in barrel but not sure of a brand or model to go with, research keeps coming up with Faxon but open to any input. Any and all advice is welcomed. Thanks in advance.