WATCH THIS FIRST: https://www.youtube.com/watch?v=ZFqOK843IyU
As a followup to that video, Bloke wrestles his M1 to demonstrate how the primary extraction doesn't work. Cos that's not really what's going on with that little helical movement of the bolt as it opens - it's actually doing something else entirely :)
Also contains a small diversion into the myth of the extractor turning the case in the chamber.
This is also interesting: Nathanial F explains "anti-pre-engagement" https://www.youtube.com/watch?v=B3-vEiMeYlM
Firearms history, blokesplaining firearms mechanics, mythbusting, shooting sports and kitschy sketches all in one place. An often dry and sarcastic look at whatever takes the Bloke's and the Chap's fancy in the world of guns and shooting.