I just finished a series of 75 half hour long videos about building a 4 bore rifle. It goes into a good amount of detail on every step along the way. It might be interesting to someone thinking about getting into building guns. I got kicked off You Tube a little while ago so I got it all on Rumble. Here is a link to the first video in in the series.
https://rumble.com/vigps1-4-bore-rifle-build-part-1.html
https://rumble.com/vigps1-4-bore-rifle-build-part-1.html