It depends on what you want to find out.
You find a published list of serial numbers for the maker.
Missouri does not have gun registration!
Find books on the maker.
you will find it on the barrel or action of the firearm
By the serial #
Serial number and/or features.
No
serial number 28402
On line auctions, gun shops, gun stores, pawn shops
You cannot find out unless you provide the model number with the serial number.
proof house.com
call the maker.