Glad to see someone agrees with me
I remember getting the Lead Cannon for the first time in Duke Advance and laughing out loud at how rediculous the thought of the weapon is. It is really awesome though! Only Duke would be able to stay on his feet after firing a quadruple barreled Shotgun.
The gatling gun he used in Time To Kill was a pretty devastating weapon and is a personal favorite of mine. If I had to choose some kind of weapon not used in previous Duke games, I think it would be neat if Duke had some kind of gun that shoots razor sharp discs that slices and dices enemies.