Mismatched new model army serial numbers from the factory?

[backpacker336]

Recently purchased this and I noticed the barrel serial and grips do not match. The trigger guard matches the serial number in the grips. I am also wondering what the "I" means before the numbers in the grips.

 

[Keller]

Factory typo? Makes you wonder which one is the right one?

 

[JasonGTA]

I wonder if it hit the stamping guys desk on a Monday morning or a Friday afternoon?

 

[backpacker336]

Yeah right... the real kicker is I overpaid for this thing and the antique letter that came with it is for the barrel serial number >.<