prarie ghost & Hunter4752001:

A good place to start is with Jon Speed's comprehensive article on the Commercial Oberndorf Mauser variations, right here on NE.com in the Nickudu Files.

Read it HERE

In the first paragraph of that article:
"Commercial Mauser actions were made on the same machinery used for military production. Rough components then went to the Sporting Rifle department for final machining and modifications which required special tools and fixtures. Tolerances were kept tighter than for military actions, and greater care was taken in fine-tuning and finishing."

Then there was the inscription on the left side of the action "Waffenfabrik Mauser Oberndorf A/N" before ~1922, and "Mauser Werke, Oberndorf A/N" after 1922. Military actions were various, including "Gew.98", "Mod 98", etc.