New Colt barrel markings?

[sig1473]

My new LE6920 has a "CR" prefix serial number. Both barrel and upper are marked 13629.

Interestingly, the FSB does NOT have an "F" mark, yet the rifle was perfectly zeroed at the factory. Not sure if this is an error in marking or if Colt is leaving the "F" stamping off the FSB now.

This has already been answered/covered. Read Post #3https://www.m4carbine.net/showthread...n-F-marked-FSB

[HMsailor]