A friend of mine had a gunsmith cut down an old double barrel 20ga shotgun for his grandson (age 7). 18" barrel and short stock. Since it's a break-open, the gun is very short, but all dimensions are within legal limits. This is the FASTEST little gun I've ever handled. The short stock even shoulders well enough for an adult to aim in a pinch. Would a gun like this fit in anywhere in a self-defense role? Thanks. L