Okay no offense
But first of all, a soldier, nor a merc, would really use a shotgun as a primary, its usually a machine gun, or a rifle, and the shotgun can be a secondary. Second off, a sawed off shotgun has only 2 shots. I saw a load in of 4 going into it. Also, a steel door wouldn't get a hole blown into it by a shotgun. It would absorb it. A grenade doesn't cause explosion damage, it send pieces of metal at u and thats what would kill you. Also shotguns are CLOSE RANGE! You not gonna hit someone if ur shooting at an elavator that far away. Also, do u have ANY IDEA what a shotgun fires? Small metal beads, that spread out and can hit multiplepeople. Also usually a shotgun loads from under it cause the slugs are big, and to fit 8 in, u need more room, so it goes into the under barrel. Also to hack a keypad, u remove the keypad, take the wires from that, and wire it to your hacking pad. Also, the auto-shotgun, it hold 8 shots. Count better next time. Also a shotgun can most likely break your wrist if u only use one hand. When the guy jumped from when he was repelling, he would have had some broken ankles. And my last point, when they repeled, they wouldn't use a link of the chain link fence, it can't support them. But the bar at the top of the fence could work.
Sorry for the rant, but it just bugged me, and i wanted you to know the proper facts.