first off, i have a fenced in hard, gate cannot be opened by hand from the outside, only my landlord, a trusted friend, and of coarse, my wife, can get in the gate.
wife has a key
landlord and friend will always call first
so, if someone knocks on my door, they have no business being there. they either forced there body through the fence (pushing on it hard enough might allow a small person to slide in) or they jumped the fence. i grab my shotgun, check the peep hole, stay put, call the cops. shotgun is onlyt used if the person decides to come in forcefully.
but im willing to bet, that if a BG jumps the fence with two dogs in the yard, and goes up to a house with two more dogs barking inside, and still want to rob me, i doubt he is going to knock.
and im with others, why an unconventional firearm? and if you think you need a gun, why answer the door?