Sure. But the whole "shield versus gun" thing came out of Stupidmonkey finding the idea of a gun being used for defense amusing (as opposed to armor and/or shields).
Actually, I would say that the gun is great as an intimidation tool, not a defensive tool. And intimidation, to me, seems to be an offensive style, not a defensive style.
In my head, when people talk about guns for defense, for some reason I see people blocking punches with bullets, which I understand is very effective, but it still makes me giggle.