There are no Mauser 98 actions presently mass produced in Belgium.

Here is a copy of an email sent to Sarco to get clarification on their misleading advertizing.
Note that they state manufactured by Dumoulin of "Belgium" but not made in Belgium.
(They are manufactured by Dumoulin of Belgium in China.)

"Some dealers are advertizing the Dumoulin action as Belgian contract made in China.
Can you confirm that the actions you advertize are in fact manufactured in Belgium.
I find it hard to believe that a Belgian arms manufacturer would machine a surplus of actions and sell them to third parties at such a low cost. Milling is more expensive than CNC machining and the latter actions sell for $4000 and up."

Reply, if I get one, will be interesting.

You can see their ad here:
http://www.e-sarcoinc.com/dumoulin-mauser-action.aspx