They are put together by spot welding the side seams as opposed to crimping them. There seem to be follower-stopper crimps at the top. They use two rolled (tension) pins on their bottoms, not solid pins. Unless I'm mistaken, any single pin Luger mags were of Imperial, WWI, or Wiemar eras, basically before WWII kicked off and Haenel-Schmeiser became the standard OEM.
Triple K website lists 4 combinations of stainless or steel bodies, and wood or plastic bottoms. I'll bet they have always had plastic followers. Prices are about the same as what you can find a MecGar listed for, or maybe a bit higher.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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