Second Upper - Need Extra Bolt?

[MaineMan2]

My first 308 AR build ran like a top out of the box. Only problem is it weighs 12-1/2 pounds with scope. So I’m assembling a second upper using a Faxon 16” Gunner profile barrel and Aero Precision upper receiver (to match AP lower). I used Aero Precision’s “enhanced” upper and handguard in the initial build.  However, I’m using AP’s normal upper and lightweight S-One handguard this time. That alone will save 1/2 pound according to AP. 

Is it OK to swap a BCG and especially bolt back and forth between barrels?  Read somewhere that the bolt and barrel extension lugs wear together and sort of need to be mated. I’m not shooting competition and seriously doubt I’ll top 1,000 rounds a year - probably more like 500. 

[jtallen83]

1 hour ago, MaineMan2 said:

Is it OK

If the bolt is sound and headspaces on the barrel then it's technically OK to shoot it. I would still recommend having a dedicated BCG for an upper, parts that slide together should ride together.

[MaineMan2]

12 hours ago, jtallen83 said:

If the bolt is sound and headspaces on the barrel then it's technically OK to shoot it. I would still recommend having a dedicated BCG for an upper, parts that slide together should ride together.

I like that “parts that slide together should ride together.”  Thanks