A few years ago a local car stereo shop owner was severely beaten and had his leg broken by 3 thugs. When they tried again a few weeks later the shop owner opened up with a shotgun. He killed one of them and put another in a wheelchair for the rest of his life.
Click on the link for the Draco “pistol” This with a green laser is a formidable weapon for protection. It is ugly but you have 30 rounds in a magazine and the AK style construction gives excellent jam free clambering. Foot lbs of energy is about 1050 foot lbs. This is 2 to 3 times the energy of a 45 ACP dependent on which 45 cartridge you are using. Zero the green laser for 100 yards and a center of mass aim point will insure an impact in a vital area from the muzzle to 150 yards.