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Some of them do. I bought one at Sail last year. It would not feed, and sometimes would not extract a hand-fed round. I called the importer and was told to wait until they had a gunsmith on staff to do warranty work. I missed the warranty expiration date due to amove, so it is now in with a (pay-for) gunsmith for a fix, I hope.
I looked at the article referenced to see if I could tweak the mag lips and springs to fix it, but I either didn'd do it right or the problem was something else.