differences??!
apparently identical,
well, at least from the period
when this was written
by gary cunningham
back in april 2005
...
"...
The Marine OKC3S Bayonet
....
With the recent introduction of the Ontario OKC3S Bayonet into the Marine Corps, I naturally wanted one for my collection. But again, these are available commercially, and the commercial specimens are absolutely indistinguishable from the military issue (as are the Ontario M9s and late Lan-Cay M9s). I understand that this was at the specific request of the Army and Marine Corps. The official reason behind that is that the bayonets are supposed to be "off the shelf" items, but I think that another possible reason is that soldiers have been known to substitute a commercial bayonet for the issue one that they have lost or damaged. This way at least the military does not get a lower quality item in place of the milspec one originally issued...."
http://www.usmilitaryknives.com/bayo_points_28.htm