Just wanted to say thanks to whoever it was that put the chart in here showing what year the rifles were made. I bought my 760 second hand in 1961 and I've always been curious of its age. Turns out is made in Sept of 1954.
And I guess Remington did a good job because you can still drive tacks with it, and I sure never coddled it.

The page has been updated as well and now includes a diagram to locate the codes. I've also added a direct link on the home page (Manufactured Dates) pre Jay's suggestion.

http://www.remingtonsociety.com/rsa/questions/barrelcodes

Another people might find handy, it's not pretty and sometimes it may not be entirely readable, but here is a link to the copy of Remington Rifles & Shotguns Serial No factory data sheets. There's a previous / next button but no index or anything.
Legibility complaints not accepted, blowup requests maybe...

http://www.remingtonsociety.com/rsa/questions/FR00

Now, this is interesting. By the barrel marking (AZ), my model 14 is March of 1931. But by that serial number list, on page 55, my gun (121xxx) was made in January of 1930. Hmmm.

That page says it is Model 14 Rec. Does that mean that my receiver was made in January of '30, but they didn't get around to putting it together until March of '31, which is when they stamped the barrel?

It's not at all unusual for the serial number to have an earlier manufactured date than the barrel code. I have several 721s/722s/700s that share this scenario. Some by several years.

Den

The receivers were serial numbered, then assembled at a later date. Sometimes they were picked over for quite some time; months and even a few years. The barrel code indicates the assembly date.