I found the article I got my info from. It is dated April 2013. It says that Blaser was in the process of building a facility in which they will build their own actions. I can't say with certainty that Mauser has started Mauser action production, but it seems they have had plenty of time since this announcement to have production under way! It is true that Mauser has been using Prechtl action for a number of years. However, things have changed, or are going to change very soon:

"Blaser is in the process of building a new factory just for Mauser, in the Blaser complex, and there they will begin making genuine Mauser 98 actions. Mauser will supply barreled actions to Rigby in London, where they will be stocked, proofed and finished."

Matt

http://huntforever.org/2013/04/09/rigby-mauser-together-again/