A few quick questions about the gun: does the barrel have a rib on it? If so what kind? What kind of forend? Is it checkered or corrugated? What is the condition over all? With those asked the gun was made in 1917 and could be worth some coin but is dependant on what it is. If you are going to shoot it, and you definitely should- a lot, you should have the chamber measured. Even though it says 2 3/4" it may be short because paper shells were shorter, roll crimp as opposed to a star crimp of a plastic shell. Shooting it might kick you more than it should not to mention raising the chamber pressure because there will be plastic from the shell in the forcing cone. If you are interested in finding out more about model 12's there is a book by Dave Riffle called "The Greatest Hammerless Repeating Shotgun Ever Built:" which is the best book on the gun out there. Awesome shotgun good luck with it.