I saw this on Armslist. Someone in central Indiana has a M&P 15-22 pistol with a forward vertical pistol grip installed. I am no NFA expert, but wouldn't this be considered an AOW by the ATF and therefore be highly illegal without the proper paper work and tax stamp?
ARMSLIST - For Trade: Smith & Wesson m&p15-22p
ARMSLIST - For Trade: Smith & Wesson m&p15-22p