sorry federal law say 21 to own the shockwave and others like it
Quincy - Quite sure you will not be covered under any 'concealed carry permit' provisions .. since this isn't exactly concealable on your person. You really need to find a knowledgeable concealed carry instructor to help you wade through all this .. The cops, while they will tell you something, probably don't really know the actual details of the laws. The vast majority do not. A good concealed carry instructor would know, as it is their business to know. I don't believe you can buy it until you are 21. However, I believe you could legally possess it, should someone (a private individual) loan or give you one, at age 18 or above. Just double check - you are responsible to make sure you are within the law.
Quincy, no Sir. The minimal age for purchase is 21 since it is classified as a "Firearm" and not a long gun so it follows the same laws as a Pistol for purchase. I would talk to your local Police or Sheriff on your specific carry for accuracy laws since they enforce them.