Gryph, here is an excample of the types of machines that Prechtl have in their workshop which they use to manufacture Mauser Actions.

http://www.prechtl-waffen.de/ber-uns-cat291.html

A quick translation:

3 Manual milling machines
6 CNC milling machines
2 Manual lathes
1 CNC lathe
1 Surface grinder
1 EDM Spark eroder (Another form of milling machine using electric current)
1 Engraving machine (More milling)

You can see the number of milling machines versus lathes, that why they cost heaps to make.

What we have been discussing above is mainly for Mauser actions, when you start talking Mannlicher Schoenauer type actions the degree of difficulty goes up several notches. Much of the internal action machining requires very specialised machines and/or tooling. They are very difficult to make.

Waidmannsheil.