There is a chart at the bottom of this page: http://www.remington.com/magazine/history/m11_5.htm
To determine the year of a Remington Model 31 shotgun based on its serial number, you'll need to consult Remington's production records or a reference guide specific to that model. Generally, Remington's serial numbers can be decoded to provide information about the year of manufacture. If you have the serial number, you can look it up in available resources or databases that specialize in firearms identification.
To look up the serial number of a Remington 7400 model in 30-06 caliber, you can start by visiting the Remington website or contacting their customer service for information on how to obtain the manufacturing date and details related to that specific serial number. Additionally, you can consult firearm databases, forums, or collector guides that specialize in Remington firearms. If you have access to a local gun shop or a certified gunsmith, they may also assist you in obtaining information about your specific firearm based on the serial number.
1930 - it'll be date code stamped, look at related links for information on the Remington Society of America.
This will tell you how to look it up. http://remingtonsociety.com/rsa/questions/barrelcodes
1928 see related link to look up exactly.
It'll be date code stamped, look at related links for information on the Remington Society of America.
1905
You can look on remington's website, but judging by the serial number it should have been made in 1980.
Check the date stamp on the barrel. The table look and details are on the manufactured date link of the Remington Society of America.
1950, there is month/year date code stamped on the barrel, you can look up the code on the Remington Society or America.
Refer to related links to look up the barrel date code stamping.
go to: proofhouse.com & look up Remington weapons