The date code during these years was just placed on the box. Please note that during the years of 1999, 2000, & 2001 (highlighted in red above), Remington did not stamp the date code on the barrels. The next letter (possibly 2 letters) will give you the year code. The first letter will give you the month code. To determine the date, you need to look for the letters stamped on the left side of the barrel. You can use the serial number to quickly decipher the date by using the chart below.
In the picture below, you will see an example from a newer Remington 597 rifle with a manufacturing date of April 2006. If you are looking for more information about your particular Remington firearms, then the serial number can give you some useful insight into the date of manufacture of your specific gun. Is unlike a number of other semi-automatic shotguns such as the Mossberg 930 or the FN SLP whose carrier releases are located on the side. The Remington 1100 is a gas-operated semi-automatic shotgun, popular among sportsmen.
