[gunsmoker]

Shoulder Stock

If it was designed for use with a shoulder stock, to be fired from the shoulder, then it cannot be a "handgun." It has to be a rifle or shotgun, although of the "Short Barrel" variety if the barrel isn't at least 16 for rifles, 18" for scatterguns. That's why AR-15 style handguns have to be built on special frames whose serial numbers were designated by the manufacturer as "pistol" frames only.

 

[gunsmoker]

Forward Grip on Pistols?

Adam, who says that if you put a forward handgrip on a pistol, to facilitate a two-hand hold, you're making it a SBR? Do you have a citation to a law or a court case or some expert saying so? Lots of people have Cobray /SWD "Mac-11" pistols, and a common accessory for them is to install a vertical foregrip, usually in a set along with a barrel extension.

The federal definition of a handgun or pistol is NOT a gun that was meant to be fired with a one-handed grip, if that's what you're getting at.