What a wise man. With all the modern weapons available, (I'm assuming a shotgun is a choice, and not a legal neccessity. Feel free to correct me if I am wrong.) he learns the shotgun. IMHO a man with a shotgun he knows well is a serious hazard to those who would do him harm.
A shotgun is relatively easy to use effectively, and it looks and sounds impressive. I say that last because (again IMHO) the acme of self defense is to never have to draw a weapon. Even an Islamofascist bomb delivery system would be dissuaded if he knew it was likely he would die before killing any Infidels.
"IMHO a man with a shotgun he knows well is a serious hazard to those who would do him harm."
Agreed... Hence my Mossberg M590.