So I have a 12 FV in .223, I'd like to make it a 6.5 Creedmoor. As I understand it, all I should need is a barrel and bolt head. Is a new barrel nut mandatory, and as this is a target rifle, would I be smart to upgrade the recoil lug while I'm at it? Good source for bolt heads? Anything else I need to think about? Thanks.

Dave