I dont think you should be actively trying to suppress these things. On most firearms forums Ive been on, a simple reference or mention of something illegal didnt imply someone trying to machine it in his own shop.
Who said anything about illegal, it's just simply that this forum has a very narrow scope. We have worked very hard for over 10 years to keep that scope narrow. A long time ago the discussion on grenade launchers was moved to its own specific forum.
Pyrotechnics are also not part of the scope of this forum.
This board is about making, shooting and the study of black powder mortars and cannon that meet the definition of antiques as spelled out in the forum rules found in the stickies at the top of this forum.
It does not include post 1899 grenade launcher or pyrotechnics.
The discussion of grenade launchers and pyrotechnics is not suppressed, you are free to discuss them all you want in the proper forum and that is not here.