While true that a pistol can never have a second vertical grip, you can have a stock-less firearm with barrel length less than 16" and a second vertical grip if the overall length is greater than 26" without any NFA considerations. Such a firearm is not a pistol anymore, but it is also not a rifle. It's simply a "firearm." If such a firearm were less than 26" OAL, it would be an AOW.
http://www.franklinarmory.com/XO-26_Letter__c_.pdf
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