Good luck killing a dozen people with 5 shots.
Take someone who is trained and practiced in the tactical use of a shotgun. They can get off at least 15 rounds in 30 seconds which, with a 5 round tube, means reloading twice.
This is all fine and dandy and I'm against an assault weapon ban.
I just take issue with the attempt to draw an equivilency between 5 shot gun shells and 75 rounds of .223.
My Mossberg 590 holds 9 shells and with that I can put 378, (that's reloading once) .24 caliber pellets downrange in less than 40 seconds. At clase range or fired at targets grouped closely together, this is a devasting weapon and much, much more deadly than either my AR or my AK. If fired into a crowd at close range, a 12Ga firing #4 Buckshot can certainly kill 12 people with just 5 shots when you consider 5shots equals 105 .24 caliber pellets.