Only if you didnt register them in the 68 amnesty as a DD.
There are about a hundred of them on the national firearms registration and transfer record legally registered. Most of them are owned by Dillon and one guy that works at THiolkol? that has most of the HE M203 rounds that are legal.
Form a company and get a type 10 FFL/02 and make them yourself! I just wish it was that easy.
True, but practically speaking it's pretty much impossible to get a legal one which is why I mad the observation about the replica carronades. In the battle of Trafalgar the first shot that the Victory fired was from a carronade that killed a number of French sailors and marines. Nelson's carronades were 3 ton monsters that fired an entire barrel of musket balls as well as round shot at the same time, but a scaled down version is still effective.