Is it possible to rifle a barrel without expensive tools and your own "workshop"? I've seen rifling buttons on the internet and have a Gamo Express Shotgun that I use only for a snake gun because I can't hit anything past 10 yards with pellets in it. If i could even somewhat rifle it, maybe I could improve the accuracy somewhat. It's a 22, but the bore after the shotgun shell adapter is not nearly that large. Maybe .210 caliber. Right now it's just a cool novelty. I think I could push a lubed .215 rifling button down the barrel. I'm talking 5 thousandths of an inch! Tell me what you think. the barrel is thick, maybe 1/2 inch of steel in diameter.
 
From what I've seen, rifling isn't that hard, if you have the ability to control the twist rate. Gunsmiths back in the 1700's used wooden jigs that held the rod and rifling button you described, and controlled the twist rate as the button went up and down the barrel.

Take a look at this: https://www.youtube.com/watch?v=D43ZeYu9dnM


 
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