Okay, here's the story. Hopefully, this will clear some things up. Frizzens, cocks and top jaws are castings that we then cnc machine on critical areas to fit with the remaining cnc machined parts of the lock. Castings sometimes have defects. In the example shown, the black dot is undoubtably acted as stress intensifier and location for crack growth to occur. When it reached a critical size, the frizzen broke.
We make thousands of locks a year. Occasionally things happen. We have had a handful of frizzens brake. This is a VERY low percentage of our total production, but we are aware of the issue and are working on it.
We brine quench our frizzens rather than oil quench. No water quenching is done. We choose to brine quench to maximize as quenched hardness. This particular lock is by far the best quality, fastest and most consistent lock that can be purchased today. In fact, timing has shown that this lock is knocking on the door of what was accomplished by the very best late english makers. We push it's performace to the limit which. With this, the occasional problem can occur.
Perhaps you have forgotten that I am a degreed metallurgical engineer as well. The difference between myself and you is that I don't choose to remind everybody of this fact.
We have everything under control.
Thank you everyone for the kind words and support. This year has proven to be beyond what any of us would have guessed here at Kibler's Longrifles. A lot of exciting stuff is in the works as well!
All the best,