The guys that said bayonet are absolutely correct. Even without a big knife hanging off the end a shotgun can still be a close in blunt weapon. Most vets remember the vertical and horizontal butt stroke, and a SG is a close range weapon, yes? Personally I have a heat shield on my 590 because it came that way, and I would not walk across the street to put one on, but you can still do very substantial damage with the butt or business end by applying blunt force. Requires practice however, but any old infantryman can show you how. Bayonet training is something that leaves a lasting impression because you are sticking a big kinfe into a humaniod form(while screaming that the spirit of the bayonet is "TO KILL").
BTW, is there really a UC person on the forum? I thought all the UC people were like our leader, guess not eh.........
Just kidding but I did teach a course there in the business school many years ago, one of the braless ugly young things noted a ribbon bar in my lapel and asked if I really burned women and children. I assured that I had only burned a few.