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A sling isn't a must-have for home defense...but here's a point that I heard raised in a video recently. If you end up in a wrestling match with an intruder trying to take your gun away from you, you can't be shot with a gun that is strapped to your body with a sling.

This gent here has a video that explains the basics of two point sling usage for a tactical shotgun:

http://www.youtube.com/watch?v=QjWOtEpvkC8