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If you put a 12 inch barrel on it, it becomes a short barrelled rifle and will be an NFA item. you will have to register it with the ATF.If you don't, its prison time. If you need more info than that you should post in the NFA forum.
If it does get registered as an SBR, then yes you can put a forward grip on it.
If it is an were an AR Pistol, it could not have a forward grip attached without an NFA registration either.
Hope that helps a little. Again better info from the guys on NFA forrum
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