I have been detailed checking each US 30 round magazine. Unfortunately I cannot let loose the details due to the hump artists.

One maker has a characteristic that applies to approx 70% of its production. I was at a gun show a few years ago, and a dealer had a little over a dozen of this maker. I inquired and naturally he said they were GI. He told me he had gotten them from a dealer in the mid-west that had several hundred of them, who got them in a surplus bid. I asked him how many were wrapped and for the other makers' markings and he told me they were all this maker marking and none were in the wrap. I knew immediately they were fakes. When new items are released as surplus, they come out of long term storage and some are still wrapped for storage. Furthermore I knew it was a lie because the large capacity magazines had already been banned at the Federal level.

I looked and none of them had the characteristic that was present in 70% of production.
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