Question on Barrel Markings

[TTinNM]

A buddy just bought a CMP Garand, serial number 5.9M. Barrell is obviously new with the following marking: CBI 6535448 1-10 06/22 6B.

6535448 means original drawing number.

Who is CBI?
06/22 appears to be date, so what is 1-10?
What does the 6B mean?

Why would such a late manufacture Garand have a new barrel?

Thanks!

[jak]

CBI is a Criterion barrel. The original barrel could have been missing or worn out. CMP installed a new Criterion barrel when they sold their "Specials" or "Expert" grade rifles. The other numbers could be a heat lot code/batch number.

[TTinNM]

thank you for your reply. Very helpful

[lapriester]

6-22 is the date of manufacture. CBI means it's a Criterion barrel. You are correct about the drawing number. 1-10 is the twist rate of the barrel, 1 turn every 10". 6B I believe is the heat lot. And the reason it has that new barrel on it is obvious. Either the original was worn out or damaged or the rifle was built up by CMP from a bare receiver they pulled out of their receiver bin.

[TTinNM]

Thank You!!