Very nice, clever design. Good idea as well, allowing you to continue shooting with a heavier trigger pull rather than having to re-cock the action while being stomped on by a buffalo. If you use carbide drills and taps you can avoid the annealing and re-heating. We use carbide all the time at work including countersinks as much of our work uses hardened material. I have been acquiring over time a full set of Ratio Drills which in my case have a drill length of 3D (Although it is actually slightly longer and you can get 5D and 7D etc.) and a shank of a nominal diameter which allows it to be held in a collet chuck. As the point is specially ground and the drill is very rigid, you do not need to center drill first, just plunge. They cost a bit of money but it is the best thing I ever did.

Waidmannsheil.