By surprisingly popular demand, here's a video about primary extraction, which is how a sticky case is shaken loose from the chamber after firing.
Featuring an M1 Garand, which has (almost?) no primary extraction, a Mauser Kar98k which has the most common type of cam-based extraction, a Lee-Enfield No.4 (NOT an SMLE), and a Swiss Schmidt-Rubin K31. The last of these is a straight-pull with a really, crazy powerful primary extraction based on helical locking lugs.
For the observant, this video is actually also a stealth Lee-Enfield No.4 vs. Mauser 98k video :D
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.