There is not much things more destructive than a 12 gauge shotgun shell to the unprotected flesh at close range. The shotgun is a very popular home defense weapon, and for good reason. It is also used for hunting. The ammunition is highly versatile, and packs a dangerous punch. However one thing has always held it back, and that was the slow firing rate of pump action shotguns.
Recent advancements have resulted in semi-automatic shotguns with drum magazines, and even fully automatic. One man decided to modify an ar-15 lower receiver, and created a portable belt fed automatic shotgun. While the prototype is not ironed out, this weapon could destroy any pigeons and home invaders with ease.