My understanding is the USMC was looking for two things in the 1993 trials bayonet which they wanted over the standard design. One was a solid tang which they believed would be stronger than the threaded tang. They also preferred the bayonet not be able to be disassembled by Marines in the field, hence the riveted tang variant. As one can see, the other pattern with screw tang is likely much weaker because of insufficient thickness of the tang (to the degree the screw threads are partially exposed). I surmise this would have been rectified had the design gone thru additional improvements.
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