JD, the correct tool is one marked with a droop wing eagle-over-63 (DE/63).
A proper magazine had a shiny nickle plated tube with an aluminum bottom. The markings on the bottom are any number with an "h" suffix and Waffenamt DE/63. Any "h" suffix magazine with this nickle plating will automatically be marked with a DE/63 unless someone has messed with it.
Good Luck!!
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