@InfraBlue,
Wrong again. You cannot provide any motivation for outlawing pistol grips other than the fact that progressives enjoy violating people's civil liberties.
The reason why you cannot provide such evidence is because there is no other motivation. Progressives simply enjoy violating people's civil liberties.
You also cannot provide any evidence that any of these features make a weapon especially dangerous. This is because these features do not make a weapon especially dangerous.