Bolt assembly and barrel assembly are what you need, the bolt carrier and firing pin are interchangeable. You look around on say brownells hard nuff you find them. I would strongly suggest that you either purchase headspace gages or see a gunshop and borrow theirs to check it once your done. Hope that helps. Torque specs on the barrel still the same, 30 ft-lb minimum, Moly grease will b e your friend here on those barrel threads, stay away from cheap steel cases unless you like swapping extractors.
To sum it up: Somewhere there is a TRUE BELIEVER training, he will not stop in his mission, he knows only the cause. What have you done today? For your brothers at arms, friends, family, your country, yourself?