Kinda scary this morning. Took my first shot of the morning at a wood duck. My gun jammed after the shot and I felt a burning on my wrist. I then realized that my sling stud had popped off the end of my magazine end cap. This is what the shell looked like after I got it out of the chamber.
That bulging really scared me, so I didn't shoot the rest of the morning. Got home and tore the gun down to see what was up. Everything looked pretty normal until I took the bolt apart. This is a gas driven ejection system. This part links the bolt to the slide rails.
I'm guessing that the gas was trapped because of this causing the powder to blow down onto my wrist and dislodged the swivel stud to come dislodged from its circlip.