I've become interested in a semi-auto HD shotgun, with features like pistol grip/full butt stock and six shot tube. A 2 3/4" chamber is all I'd ever use. When looking at Benellis' web site they list the M4 mag capacity as 4+1. It looks like a 18-20" barrel with a long tube under it. Could that be a typo? They advertise it as the model used by the USMC. Really? A four shot Elmer Fudd magazine? For $1400-$1800? If I could find a Remington 11-87 in the tactical configuration I want, I'd forget about the Benelli. Any of you guys know about the M4?