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Gerald, Against the law to place a vertical grip on a pistol. The ATF has long held that adding a vertical fore-grip to a pistol makes it an AOW subject to the requirements of the National Firearms Act (NFA). ... If the overall length (OAL) of the pistol is greater than 26 inches then adding a vertical fore-grip doesn't result in the pistol becoming an AOW. Apr 15, 2014. AOW is NFA acronym for "Any Other Weapon"

Gerald, this would change the classification of the "Pistol" and you would have to pay a $200 Tax Stamp and register it as an NFA Firearm to be legal.