Question on Colt SP1 Sporter Rifle bolt carrier

[RCS]

Here are some photos of a Colt AR-15 Sporter Rifle (SP1) with a 7xx serial number, the barrel is stamped 12 (1x12 twist) I find that interesting that a 5xx serial had a 1 in 14 twist. Mr Peppers is your three digit marked 12 on the barrel ?

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[Johnny Peppers]

Mr Peppers is your three digit marked 12 on the barrel ?

Yes. It is marked on the bottom of the barrel just as shown in your photograph. The barrel also has the Colt Verified Proof with an upside down M between the sight base rings.

[RCS]

Johnny Peppers, Thanks for checking your three digit Colt SP1. RCS