Shot my M9-A1 today again. Had some Cor-Bon 115+p lying around. Prefer GD 124+p so might as well use it up to see how the Steyr handles it. I've shot 300+ of GD's and CCI aluminum with 100% success so far. Third round of Cor-Bon and it quits. Took it apart to find the firing-pin jammed to the rear. As I was leaving I see a CB case on the bench with a blown primer. Could it be? Yes it was. When I finally managed to pry the firing pin out it was black. Three metal disk fall out of the channel also. Don't know how many layers of metal there are in a primer. But it could have been all three. Don't know for sure. I did continue to shoot the CB with my G19 and it did fine.