Part of the overall design of the M9 bayonet was the seperate tang rod in place of a solid tang blade. The patent abstracts are available in this site's library. You can read up on the details and reason for it there.
Thanks for the photos. By the way, the company name on your bayonet if I'm not mistaken is "Rothco". The bayonets were made by Paul Medrano in Taiwan and wholesaled to Rothco.
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