This stuff is all over the place. Ebay, gun shows etc and nobody is getting arrested or prosecuted. Well, maybe some of the incredibility stupid are, but they always manage to do that anyway. The guy in the article ordered an assembled unti form China. Well, DUH. Love the article BTW. He had instructions for making a Molotov cocktail. If you need instructions to pour gas in a bottle and stick in a rag you just might be a moron.

That baffle there is really pushing the line IMHO. Unless they are all blind, the BATF is well aware of all this. Thing is until you assemble it with a hole all the way though the center they are just a bunch of parts for whatever you say they are for. Hard to arrest people for owning a tube, Flashlight tubes, grease gun tubes, pieces of pipe, caps for such tubes are not illegal either. my flash light has a cap on one end. The insert is just a interesting piece of aluminum, the ones that they fill with automotive freeze plugs just have a bunch of automotive freeze plugs until some one drills out the plugs. Put, their plugs are machined aluminum. So,what until you drill the holes. They all leave it up to whoever to convert these "innocent" parts into a evil and deadly silencer. A can is far from rocket science or difficult.