I picked up a EAA MP310 O/U in 20ga with ported barrels 2yrs ago. Just wanted it for duck/dove and goose hunting. It has 3" chambers, choke tubes, TruLock tubes are the only aftermarket tubes that I found will fit it and offer extended tubes. I really like it!! have taken it to Canada 6 times for ducks and geese and my buddies have shot it as well. Fast handling, can select top or bottom barrel. Safety engages automatically upon reloading and closing it. And for about $600 MSRP, its a nice shooting shotgun.