BDL is an internal magazine with a drop away bottom, not a detach magazine.
BDL
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DM
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So....no.
I really don't understand what you need. If you want to put the BDL bottom metal in a DM stock, it should fit no problem. If you want to put a DM bottom metal in a BDL stock, it will need some fitting. But the screw holes line up on both.