Given your scenerio . . I would defend my family with a shot gun or a hand gun. I don't think the average citizen needs a weapon with a maximum effective range of 550 meters to defend their home or family. Those idiot bank robbers probably bought those weapons legally or, as your mentioned in a previous post, stole them from a law-abiding citizen. That bank robbery illustrates my points very well . . . the police aren't armed well enough and that those weapons need to be restricted for use by the police, military, or other law enforcement. And your reference to tyrannical oppression . . . you do live in California in the USA correct? To what tyrannical oppressive force are you referring?