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Thank you for the prompt and informative reply.
The KCB77, as well as the newer B2005 bayonets are made with a spring steel blade of 55Si7 at a Rockwell hardness of 51-53. The steel type combined with the relative softness makes the blade not particularly good at holding an edge (probably why the false edge nicked on the wire-cutter test), but it makes it very springy and flexible. I was informed by an Eickhorn-Solingen employee that the blade can deform up to 30 degrees before fracturing; this is probably why they survived the 5-foot drop tests. The M-9 likely cannot survive that much bending, but of course it takes far more force to even get it to bend at all due to its much thicker blade.
One thing I do not like is the boxy and less than ergonomic grip, which is based on the Stoner 63 rifle foregrip and its predecessor the KCB70.
The XM9 trials are very interesting and it would be great to see more documents about it. Do you or anyone else have any information about the USMC trials that ended in the adoption of the OKC-3S?
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