Now I see. :)
looks like the stock is set up for a detachable box but the action is not. I would recommend a paid membership ( costs about half a box of cheap ammo) and a trip to the classifieds. Find yourself a blind mag stock, and a spring and follower. Shouldn't be too difficult to find exactly what you need.
OR
One of the vendors here will have what you're looking for no problem. Check with Jim at Northland Shooters Supply or Fred at Sharp Shooter Supply
Problem solved.