I also don't think this is stress induced from firing, since this area of the bolt doesn't receive stresses that would lead to the lug area pulling away from the center of the bolt face (from the inside out), quite the contrary in fact, the force/stress transmitted by the case back from the bolt face to the back of the lugs would instead squeeze this area tighter together (from the outside in).
As BCM and I are discussing by email, I can't simply send them the bolt because of ITAR since I live in Canada, I'm contacting importer/exporters to see if they can help me out getting this bolt through the hoops to BCM.
I'm trying to find a way to get a better and closer image of the cracks.
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