There is a great M9 bayonet that just showed up on ebay. It's one of the 1993 Buck solid tang USMC test bayonets. These were used for factory testing prior to the bayonets being delivered to the USMC for evaluation. The test bayonets did not get the black oxide finish to the blades, they all have an unfinished heat-treated appearance. Buck only submitted 350 bayonets to the USMC for evaluation and there are probably only a handful of these test pieces around.
http://cgi.ebay.com/BUCK-M-9-BAYONET...QQcmdZViewItem
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XL80