That's Bad to the Bone! But with ANYTHING less than Low-Brass shells, that litl beast would kick like TWO mules...
I have a Double Pistol Grip Mossberg 500, and recoil isn't bad at all, even with premium 3" 000 Buck.
I don't think that litl SG would be VERY useful (I DO NOT think they should be illegal) but would make for quite a "conversation piece". I'd just stick with a good HandGun in .45 ACP if extra power is of interest.