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You find a web site or book(s) with sn data for the weapon you have and look it up.
Ruger has a serial number search function on the company web site.
You can find serial number data on Ruger's web site
Yes,www.proofhouse.com
Go to diamondgunsmithing on the internet and enter your serial number. That will do it.
Try the maker's web site.
Mossberg does not have a site for determining serial number/date references.
Left side under the rear site. That's where it is on my 99M1.
You will have to call Browning and give them the serial number to find out. You can also go to the Browning web site and check the sn there.
Find a book with sn's published for the weapon you have (if it exists). Go to the maker's web site and see if they have a sn look up function. Go to Proofhouse.com
Since you did not provide the serial number, you can check the Browning web site (has serial number information on it). Also, the Blue Book of Gun Values has serial number information on Browning's.
Go to Browning's site, click on Support then date your firearm.