Looking for a home defense weapon with slam fire capability. Preferably 20ga or smaller...something that is easily wielded in a confined area, 6+ rd capable preferred, controllable by my wife (primary user, and experienced shooter) or myself, and won't do to much collateral damage but still FULLY capable to stop an intruder in his tracks from 15-20ft NO QUESTIONS ASKED on the first 1-2 shots. This will primarily be a backup weapon in case something should happen to me if an intruder breaks in, or if I'm away on a business trip and something should happen. Pistol grip only please, the shorter the better. Any assistance is appreciated. Thanks!