Serial 718943w
See related link.
Check this table for the answer: http://www.remingtonsociety.com/rsa/questions/barrelcodes
Go to the Remington Society of America and click the Manufactured link, it has the location and barrel codes for month/year of manufacture.
Check this table for the answer: http://www.remingtonsociety.com/rsa/questions/barrelcodes
Look at the date code stamp on the barrel, see related link.
Do a search on barrel codes, I believe that will give you an answer
Remington Society barrel code lookup: http://remingtonsociety.com/rsa/questions/barrelcodes
Check this table for the answer: http://www.remingtonsociety.com/rsa/questions/barrelcodes
Check the date code stamp on the left side of the barrel you can get the details and look it up on the Remington Society of America under the manufactured date link.
They have date code stamps on the barrel which can be looked up on the manufacture date link on the Remington Society of America. --- Update: It's important to note that the barrel on the shotgun MAY not be the barrel that was originally on the shotgun at purchase. Check the serial number with Remington.
From the date code stamped on the barrel. Look for the manufactured date link on the Remington Society of America for details.