Since the sale of Surgeon Rifles, the decision was made to concentrate on the building of rifles instead of making actions for sale to the industry professionals and general population. Surgeon has told everyone in the business that they will provide actions IF and WHEN they have any surplus. So far it has been SLIM and NONE.
So, if you find one that is for sale jump on it quick because it won't last long.
As a simple suggestion, Defiance Machine is making the Deviant actions in all sizes including the Lapua with a 0.750" diameter bolt. The Deviant has the front integral lug and 1913 rail. Here is the link to their website:
Deviant Action « Defiance Machine
Keeping with news worthy events, McMillan Stocks has been sold also. The sale is complete at the end of September.
McMillan Rifles has sold also, with the sale completing sometime after the 1st of 2014.
Good Luck with your build!