[Unclenick]

I have modified some Garand receivers and windage knobs to have Springfield Armory-type 1/2 minute clicks. This involves drilling into the receiver to make a hole for a detent ball spring, and grinding smooth, then cutting detent notches into the inside surface of the knob. I found I had to use carbide drill and mill bits for the two cutting operations. So, it is possible for a receiver to require a carbide bit, but I haven't noticed that issue with the Mausers specifically.

If you have to use carbide, it is best to have a very rigid and relatively vibration free drill. A milling machine is better than most home grade drill presses for that reason. Vibration causes the edges of the drills to chip and dull. Use of a fixture with a carbide drill guide insert is also advisable to prevent chipping and breakage.