it is, or was
The glock knife did start life as a bayonet! I can't recall for what rifle though.
That explains some of its characteristics. V-grind, heavy point, thick spine, comparatively narrow blade, and unfortunately, that little section at the rear that is not sharpened.
+1 0n the Cammillus survival knife, I like that one too! slightly shorter, and maybe, more durable, than the std Kbar, which was conceived as a fighting knife.