I think what you found is either a DD manufacturers license or SOT.So... in doing some research, am I correct that in order to have the 20mm etc. it would require a DD permit from the Feds, and THAT permit is $3K a YEAR! ??
From my research I have found them all over the board up to 25,000.00 but hey you can ASK what ever you want it foes not mean you will het it. For a nice complete package I think they are in the 18K range but what are you guys finding out there?Whats the going price for one of these bad boys?