>>63965597
Screen cap is from
https://youtu.be/GBrkf-GAbwA?t=230

The only credit in the description section of the video:

Ezell, Edward Clinton, Thomas M. Pegg, and W. H. B. Smith. Small Arms of the World: A Basic Manual of Small Arms. New York: Barnes & Noble, 1993.

I guess those images are all from that book

>>63965578
Wouldn't that just splode the cartridge or chamber