Click for larger image: Photo from "Chris"
The other half of 350 Bayonets that were made, consisted of a drilled and threaded tang two as shown in the photo that follows (provided by Bill Porter). Bill had advised that was the second variation submitted to the United States Marines for testing.
Click for a Larger Image! Photo from Bill Porter
Finally, following is an image that shows an assembled "Riveted" 1993 USMC M9 over a threaded tang 1993 USMC M9. Please also note the knife on the bottom of photo below. This knife has a short tang rod connecting the blade tang and the pommel. This version was not submitted to the USMC for evaluation and was made in very limited numbers.
Photo from Bill Porter
I wish to thank Bill Porter and "Chris for providing the information and photos as posted above!