[quote=nursemike
I believe that proves the point.
Why is it illegal? A shoulder stock renders a handgun less concealable and maybe more accurate and controllable, which seem like qualities that BATF ought to encourage. But-it is illegal. Why? Because it is just flippin' wrong, that's why. You would never imagine John Wayne drawing his peacemaker, clipping a stock on it, shouldering it and firing at some miscreant. Wouldn't happen. [/quote]

Sigh, for the same reason that if you take a Ruger Charger action, and put a barrel from a 10/22 on it, you're legal, but take a 10/22 action, and put a charger barrel on it, you've made an NFA weapon, and it's illegal - the actions are identical except for markings, but put that 10-22 action in a charger stock and barrel, and you've made a "short barrel rifle"