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RE: Massachusetts--the birth place of liberty--celebrates the 4th of July with new GUN SEIZURE LAW....Wait, what???
https://gunsources.com/pvc-pipe-shotgun-barrel/
So... when I was in infantry school, I attended a course on the history of small arms, and the claim was made that you could do this. It could be an issue of this man's design, but that didn't work out so well for him. You can definitely make one out of steel pipe, though.