Doug, thanks for sharing the pictures with us. Your 220 in 16 gauge is what I call a Second Model Utica. It has the slim trigger and alloy guard. The First Model Uticas had a steel guard, gracefully curved and tapered to the rear. The "15 Y B" are assembly numbers and show that your gun is a factor original. The 3 in a circle is an inspectors number. I would need to see better pictures of the forearm, but feel it most likely is original to the gun. Very few forearms had markings on them. You might look closely inside in front of the attaching metal for a single digit number like 7 or 8, but very few even had these. The .30-30 barrel you have is for a Model 219 B or C. The stud is to cock the A, B, C, & D suffix actions. It is not needed to cock your 220 action as the striker is cocked when the top lever is moved all the way to the right to open the action. This stud is not needed and can be removed, but I would leave it in place unless it bothers you. As to fitting the barrel, if you are not handy with metal work, you may need a gunsmith to fit for you. However, there are two things to consider. One, the barrel inletting for the16 gauge forearm wood will be a little wide for the .30 caliber barrel. Also, if you modify the metal to fit the .30 cal barrel, then most likely it will no longer fit the 16 gauge barrel. I suggest buying a later style B, C, or D suffix forearm with the attaching metal. I hope this helps some. Best wishes, Garnett
