The M9 copies from Taiwan are manufactured by Pablo (Paul) Medrano. They are a very good quality bayonet for the price. He has several different blade configurations and they are available in the standard finish or black oxide. He sells them on ebay using the name Mr. Pauly. You can also order them direct from his website. If you buy more than one you can probably get a break on the price; but even if you don't they are very reasonably priced.
Medrano's website
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