Drew, I have a 1909 3E #211176 that is a 2 barrel set. The first barrels are Nitro Steel and the second set are Armor Steel ,numbered to the gun, have the #2 so marked,reinforcing wedge, and are marked 3" chambers. Obviously, this gun was sent back to the factory to have these barrels fitted to the gun. Also has it's own forend. First set is 32" and the second set are 26". Mike H.