I have been surfing the web looking at tactical shotguns. I really don't care for the term "tactical", but what I am looking for is certainly not a bird gun. Here are my requirements: 1. Barrel Type: A breacher barrel. Does anyone have experience with a breacher choke tube? Do they work? How much to they extend the length of the gun? 2. Barrel Length: Shorter is better to me as maneuverability is important. 3. Stock/Overall gun length: What are the pro/cons of pistol grip, traditional stock and folding stock? I want something very sturdy, as a primary requirement is...