Head spacing an upper?

[SouthTXBowhunter]

Noveske gives you the option to buy a headspaced bolt (w/ or w/out a carrier) when ordering a barrel from them. If you're concerned about it.

 

[Sogan]

Brand new bolt and barrel - No need to check
New barrel and old bolt - Check it
Old barrel and new bolt - Check it

Go, Go-No gauges help a lot as well