Picked this up at a gun show. Is there a consensus on the provenance of these unmarked mags? No date codes either. Locks in okay though and feels like the real deal.
Interesting--- the follower (plastic- right hump) and base plate appear correct, but I have not seen a magazine body that was not marked without "MP5 HK/date", "date/MP5 HK", "SD/MP5 HK/date", or 9mmx19/date code on the lower left.
You are quite welcome--- I have never seen (or heard) of an aftermarket, 30-round, straight magazine. However, I would say that it is legitimate--- I will await other opinions before I add this to my data.