Nice bayonets Fabrizio!

My only question is about the pommell screw.
Since, as Bill reported, these bayonets were submitted in 1988, why did they use the screw usually seen on the Buck 1991 USMC M9?
I'm referring to the one without the "cut" in the middle.
I posted pictures of both screw types on this topic
http://www.quarterbore.net/forums/sh...1506#post11506