I've been on the search for another barrel for my 1100 12ga. for a while now, so I can cut one of them down to 18". My gun is chambered for 2 3/4" shells right now. I found a old, but new barrel for $55, problem is, it is a 3" chamber. Through my horrible internet research, I've found that it will work with my receiver, but that I really should only shoot 3" shells with it. I'm looking for some more input on this, before I buy it tomorrow. Will the rest of my gun handle the 3" shells?