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I agree that if I were to use it for defense, I'd likely opt for the 000. At 9-12 feet it would be pretty damaging I think. your shot placement wont be as good as a single round, but at very close range it shouldn't matter.

I had one with a 6 inch barrel and sold it. It's a fun gun, but mostly impractical for any need I had. Even with the six inch barrel, the spread was pretty dramatic. However, with the heavier shotgun loads it was pretty devastating at close range. Of course, 2 or 3 big pellets are all you get, as opposed to more smaller pellets.
in the end though, it was too heavy to comfortably carry, not terribly accurate and had no one particular feature that redeemed it. (other than being FUN). I've got no problem with the gun, but would pick others over it depending on my intended purpose.