When I ground the locking lug off the bolt I cut through the case hardening using a bench grinder. The case was very thin and the rest under it was very soft and easily removed with a file.
If anyone has a Krag bolt with a cracked locking lug I would be interested in obtaining it for another experiment. I want to see if a cracked locking lug will set back. I can check this with feeler gauges at the safety lug.
I run more then a hundred rounds through my Krag in the summer so would be easy to change bolts and see for myself.
