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Do you have a good machine/welding shop near you?? Near as I can tell savage took 2 300 win mag mag boxes cut em up and welded em together. I have an stw box I can't part with but I could take pics and measurements for you so you can get one built. If you want to play that game drop me a pm and we can see what we can do to get you taken care of bud.
Nope mines a stagger feed blind magazineBushwacker,
Is this the old Savage metal box your working with that had the release button on the side of the stock? These In the picture are short action. You could use these to build a longer mag. View attachment 112224