My gun also has the BO over the serial number, not sure what it means but it's not the date code.

Ted, you said that "the code only accurately dates the barrel, so if the gun made it back to Remington, it could be wrong."

On my gun both the barrels are numbered to the receiver, so I would assume that matching serial numbers would give an accurate month/year of production.

Having said that, according to Remington, if a gun was sent back for repairs it recieved a ssecond set of letters to indicate when it was repaired.

It's a very confusing system to say the least, the only way to know for sure is to ask Remington.

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