Import I have to admit, it's a bit outside the box
I read somewhere that 180K rifle was made and there was 3 differents accident that happens, speculations says that all 3 were hotload or shady situation, this was before Blaser change a plastic part for steel to reinforce the bolt in lock position
Import, the only officially recorded failure of that action was when it was being tested by the (Italian?) police and they started removing the locking teeth one by one and firing it until they got a catastrophic failure, I think they removed all but 3 of the teeth at that point. Also, there are rear lugs as well to hold the bolt in place, even if the bolt-head teeth let go the bolt still wouldn't go anywhere.
I love shooting the blaser rifles, it's such a fun action.