"K" Magazine question

James, I doubt that your mag tube is stainless, unless it's a new triple K repro mag. What you probably have is a nickle plated, flat button (no rim around the follower button), 1st issue Haenal Schmeisser mag with a stylized "H" stamped on the bottom of the spine. These were Police used mags, added to many of their PO8s in the late Weimar & early Nazi period. Not factory issue for a Military K date. Tom h