While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Around the 60/70's they switched the location of the serial number on the rear tang area ... so if an older rifle gets a that part of their tang replaced with a newer one, you end up with no serial number.