You need to do more research as well.
But its scary to a lot of people.
I consider these little different than pipe bombs. There is a good chance they are made from tubing.
Most American made ML barrels that run around 200 bucks (cheap in the quality barrel world) are improperly breeched and about 80-90% need to be refit or sent back. Yeah i build MLs and belong to a gunmakes guild. Its amazing. But properly fitting a plug is very time consuming on average. I don't build guns with leaded screw stock barrels and none of then come breeched.
This is a plug from a big name ML barrel makers barrel The rebate actually ran up into the bore and formed a wonderful fouling trap.
I replaced the barrel with a GM before the customer got it back. I did not want to be in the liability chain by having it in my shop. Had this been shot with Pyrodex it would have looked far different.
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Dan