A new, short chambered barrel, would be easy to headspace with the proper pull through chamber reamer.
Headspacing thi sway is almost as easy as checking the headspace.
Pull and turn as you are closing the bolt. As soon as it closes, you are at proper headspace. They sell different bushings. I always headspace to minimum spec.. Chamber has a longer life, and besides, it is easier to remove more metal than to ad back later:

)
:roll:
As CornBread said, if you use a barrel, bolt, receiver, and oprod that are like new, but previously mounted and headspaced, you should have no timing issues, Barrel bolt and receiver
should index and headspace correctly.
Good luck and have fun....
Gerry