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It has to be a "Pistol" type Grip Jason. No Shoulder Stocks to turn this into an NFA item.

Hi Jason, It must be a Pistol Grip. Everthing else would become NFA and would need tax stamp.

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this gun is in such a gray area with legality that I suggest being very careful. a sholder stock would turn it into a NFA item but a true pistol grip may make the OAL to short "Read more: https://www.ammoland.com/2017/05/mossberg-590-shockwave-firearm/#ixzz581RnleMd Under Creative Commons License: Attribution Follow us: @Ammoland on Twitter | Ammoland on Facebook This is a unique firearm with a 14″ 12 Gauge barrel and a Shockwave bird's head pistol grip that gives the firearm an overall length of 26.5″. "It is considered a firearm and in that regard it need only be over 26″ in length without requiring NFA (National Firearms Act) paperwork and taxes." so if your pistol grip shortened the OAL by .5 inches you would then be Illegal https://www.ammoland.com/2017/05/mossberg-590-shockwave-firearm/#axzz581RL6GHn

Absolutely do NOT put a buttstock or regular pistol grip on this. It would then be an NFA firearm. If you changed it out it would have to be a pistol grip of the same dimensions to keep the overall length at 26", or more.

no sholder or pistol grips they both would make this a NFA item. This is a unique firearm with a 14″ 12 Gauge barrel and a Shockwave bird's head pistol grip that gives the firearm an overall length of 26.5″. "It is considered a firearm and in that regard it need only be over 26″ in length without requiring NFA (National Firearms Act) paperwork and taxes." so if your pistol grip shortened the OAL by .5 inches you would then be Illegal ammoland.com/2017/05/mossberg-590-shockwave-firearm/#axzz581RL6GHn