Free: Contests & Raffles.
So he wants to do this build himself or is he going to have a gunsmith do it for him?
Look at actions that can take pre fit barrels if he wants to do himself.
That, or, and this pains me to say it because I really don't care for how they look, do a barrel nut setup. It's a personal esthetics thing with me but they work well and make headspacing a new barrel very easy.