In the world of gun innovation almost anything is possible. For instances, this Youtuber made a barrel out of a rebar. He constructed the barrel to fit a .22. Here’s the excerpt of his process: “The barrel is made from ~1″ rebar about 18 inches long that I got at the local scrap yard. First I center-drilled the end and went about 3″ in with a standard-length 5/16 drill bit. Then I deep-drilled it about 10” using a Dewalt branded installer bit from the local home center. I expected this bit to burn out pretty quickly through so much solid...