But when buying used shotgun or rifle, it is better to check when it was manufactured, that is why Remington serial number check was developed.
Remington Model 1100 Serial Number Lookup: Please know that after 1921, Remington shotguns have a code located on the left side of the barrel near the frame that identifies the year and month of manufacture Gun Manufacturers These two letters can be decoded to find out the date your firearm was manufactured.
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Remington Model 700 Serial Number Lookup: Remington Firearms manufactured after 1921 have a code located on the left side of the barrel near the frame that identifies the year and month of manufacture.