You need to contact stack on who makes field and stream and you need to serial number off the back of your safe
Contact the maker.
418lbs.
A local locksmith
480 pounds. Door is removable for easier installation.
You can contact the manufacturer of the safe and they will be able to get you the combination. You may need to supply them with a notarized letter stating you are the owner of that safe. Otherwise, a locksmith can get into the safe and change the combination for you.
Contact the maker.
No.
Basically by rebuilding the safe. Not practical to try this. Sorry
To remove the door from a Field and Stream gun safe, first ensure the safe is empty and securely anchored to prevent movement. Open the door fully and locate the hinges, which are typically on one side of the door. Remove the hinge pins using a hammer and punch or a similar tool, and gently lift the door off its hinges. Be cautious, as the door can be heavy, and consider having someone assist you.
Contact Sentry or a qualified locksmith.
Contact the maker.
You will need to contact Sentry or a good locksmith.