A regular double barrel shotgun, except someone took the time and effort to saw off a few centimeters from the barrel (and possibly the stock as well). this modified firearm is very useful for short-range crowd-control.
A sawed-off shotgun is easier to hide in a tuxedo than the original shotgun.
A sawed off shotgun, in which the barrel(s) are sawed off to become shorter, for the purpose of the pellets inside the shells to spread out over a vast area. The accuracy is lessened by this but a sawed off 12 gauge is a gullyweapon to have.
"...Up into my bag, cuz I gotta get my mask
and shells to put in this 12 gauge sawed off...