That sucks, but also keep in mind that Tool Craft also makes many of the bolts that are marked for other companies so they have a lot of BCG out in peoples hands. No defending broken parts but it happens. All companies have duds, maybe time will reveal this is a trend and their quality is becoming sub par.
What bothers me is he broke 2 of them. The first around 15k rounds. The second broke alot sooner. I was thinking of getting one but am gonna hold off and see if there's any news of more breakages.