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Since the ATF classified the Gatekeeper II and the Tac-14 as firearms instead of shotguns, they can have a barrel shorter than the NFA requirement for a shotgun barrel of 18.5-inches. The 14-inch barrel means that a user cannot install just pistol grip like a pistol grip shotgun because it would make the overall length too short. The firearm would then be considered an AOW (Any other weapon).

Read More Courtesy of Ammo Land...