WSM bolt head question

[sha-ul]

Just out of curiosity, what has to be done to install a WSM style bolt head with the standing extractor on an action that did not have that originally?

[Robinhood]

The head with the slot for the standing "Ejector" is considered a controlled round feed and was utilized with the stagger feed magazines. The new style is push feed and can be use with both stagger and center feed magazines.

If you want to use the standing ejector you will need to cut the slot in the bottom of the action. The trigger hanger pin goes through the hole in the ejector.

In this article by Mr. Eddy you will find some pictures that may help you.
http://www.savageshooters.com/showthread.php?32923-CRF-ejector-modification-for-improved-bolt-operation

[sha-ul]

So, what all models used the standing ejector?

[Robinhood]

Only the WSM(SA) and UltraMag(LA) chamberings had them to aid in feeding.

Edit: These were for the Stagger Feed magazines only if I remember correctly.