Ordered a new bolt head. Hopefully that will solve the problem.
Coincidentally, I had been reading about M95's sending the firing pin out the back on a facebook forum and I thought the guy was full of it but I can now see how this could happen. This crack could easily turn into a break which would allow the firing pin and the cocking knob to fly backwards if there were gas blowback from the primer area. Probably not catastrophic but could still ruin your day.