Some additional information. On the Mossberg site they state:
How old do you have to be to buy a Mossberg Shockwave? The Mossberg Shockwave is a firearm, not a long gun. Federal Law requires purchasers of firearms to be 21 years of age.
Also
Do not carry the Mossberg Shockwave concealed. If this gun is carry concealed, it would be defined by BATFE as an A.O.W. and the user could be charged with possession of an unregistered NFA weapon.
How old do you have to be to buy a Mossberg Shockwave? The Mossberg Shockwave is a firearm, not a long gun. Federal Law requires purchasers of firearms to be 21 years of age.
Also
Do not carry the Mossberg Shockwave concealed. If this gun is carry concealed, it would be defined by BATFE as an A.O.W. and the user could be charged with possession of an unregistered NFA weapon.