Using barrel codes (such as those listed above) to date the manufacture are reliable on Remington rifles, as the company rarely changed barrels on a customer’s rifle. Serial Numbers by date (factory record book) – K – P – O – W – D – E – R – X Barrel Code Location Diagram Months of the year, for example B=January, L= February Near the frame that identifies the year and month of Have a code located on the left side of the barrel
