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With the MPX you don't have the OAL to make the "firearm" argument like you can with a 10.5" AR pistol. So short version is if you're trying to be compliant with the law, don't use a foregrip marketed as "vertical". A3 tactical has some 45 degree AFGs worth trying out.
anywhere from "horizontal" and "vertical", depends on the ATF Agent in charge's mood 