I have a question for the Browning experts. Are Browning Citori barrels interchangable? What are the differences? I shot sporting clays with some friends recently and I used my Citori XT trap with 32" barrels. After lugging it around for 2 hours it got kind of heavy. My friend used a Citori GTi with 28" barrels. I shouldered it and it was much lighter. So I thought maybe I would look into buying 28" barrels. But, there was a problem. When I tried installing his GTi barrels on my XT. It would only closed half way. He had another Citori (not sure of model) with 32" barrels and it would only close half way as well. Any thoughts?