Fwiw, I volunteer at the local range as a range safety officer. One day I observed a couple shooting a Glock 21. The female was shooting the gun and after every shot, she'd get hit in the forehead with the empty shell. To give her credit, she didn't give up and kept on shooting... Her husband/boyfriend/whatever was coaching her. 'Bang, whack, bang, whack' (against her eye protection), round after round...
I finally couldn't take it anymore and went over and asked if their Glock always does that. To which the guy responded, "It's suppose to do that. It has a top ejection system..."
I managed to 'maintain' and tell him that Glock will fixed that under warranty and that the normal ejection pattern should be going over one's shoulder, not between one's eyes... <g>