Originally Posted by After Shock Media

A pistol grip mossberg will work. While your at it attach a medium to small mag light under the barrel about 1/2 short of the barrel tip. A standard 12 gauge will do you just fine and your girl will have no real trouble using it if she has to. Worst case is a small bruise if she handles it wrong. A 20 gauge is just to weak.

Then just do a shell line up. Mine personally is rock salt, then pellets, then slugs. First one wont kill anyone but will definitely deter if needed and then it goes lethal to damn lethal even behind shit.