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sig arm brace
The SIG MPX is a gas-operated submachine gun designed and manufactured by SIG Sauer, and is primarily chambered in 9×19mm Parabellum cartridge. It is a gas-operated firearm featuring a closed, rotating bolt. These design features, rare in submachine guns, were chosen to enhance the safety of the user and to have a more reliable firearm. It was designed in 2013 and was released to the general public in 2015. It features the SIG Sauer short stroke push-rod gas system to reduce the recoil and improve the reliability of the weapon.
The MPX, in its second generation, features a system that would allow for conversion from 9mm to .357 SIG or .40 S&W. However, since its inception, first party conversion kits have not been made available for either of the two production generations of the gun.SIG Sauer also used the same gas piston system to develop the SIG MCX carbine.
Here's the link to the actual statement and request for comment from the ATF on pistol braces. Please take the time to read it and comment, if for nothing else, than to comment on their lack of clarity and consistency in making rulings.
Federal Register :: Objective Factors for Classifying...
Hooray now we can finally put the Sig arm brace for shoulder. It just cannot be modified. You still have to be able to put it on your arm, through the brace. I think I have to keep my extra arm brace now just so I can put it on an AR pistol.