The blind S/A centerfeed stock I have from Boyds had a similar issue, but not in as many places. On it it was just the mag well length that needed adjusted. The Boyds has a hump on the rear wall of the mag well similar to the hump yours has on the front end. I simply took my dremel to it with a small sanding drum and knocked it down a little at a time until I had just a slight friction fit with the mag box and L-clip.
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