I just had a conversation with Jim at NSS about this very issue. I am looking for a center feed magazine for a .270 myself. Jim said that the detachable box magazines are the same thing as the blind box magazines only with a floor plate attached. He said you could buy a DBM and remove the floor plate and have the part that you are wanting. The box, spring, and follower are identical with the only difference being a floor plate. Hope that helps.
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