300 WSM case ejection

[geezerhood]

I lucked into a never shot Pac-Nor 300 WSM small shank barrel as a gift and want to turn it into an AI style mag fed chassis mounted rifle.

Since I don't own a small shank action with an action mounted ejector (Do any factory built ones exist?), rather than trying to get reliable ejection from a plunger ejector bolt head, I am thinking of converting it the action mounted ejector setup.

Do any of the Savage 'Smittys' do that procedure and how expensive is it? Where can I get the ejectors? (guessing Savage won't sell me one)