First you have to find the magazine. Who makes a .30-06 box magazine? To fit the BAR? Then you have to find someone who makes the lower "metal" or plastic bracket for the opening.
I just hooked up with Tom Snyder who modifies a Savage magazine with a H&K G3 lower to make a 10 round magazine with a solid button catch. But that's based on a .308 magazine.
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