Marc:
I would like to compliment you on your recent developments in Close Quarter Combatives:
First, there is the knife material you call "The Chupacabra". I find it to be ingenious in its primal intensity and lethal efficiency-- just the sort of thing do when you have to go RIGHT NOW in conditions of maximal intensity.
This applies to civilians or to professionals in kit.
Second, there are the knives of your design. I carry the larger version, the Akita, which is the military version, on my battle belt. I can give no greater compliment!
For civilians, the slightly smaller and distinctly flatter version, the Shiba, is probably the way to go.
Not only does the ingenious handle design, found on both knives, allow for ready access when the fight is already underway, it also makes for an unusually secure grip in high adrenal circumstances. No fear of sliding down onto the blade when a thrust hits something hard, even when the handle is slippery from blood.
Third, there is your integration of gun and knife for when the gun goes click instead of bang. Not only does your ingenious transition to blade allow for ready and rapid lethality, it also enables returning to the gun to bring it back into battery without having to resheath the knife back first. Not having to find the sheath (which probably entails taking your eyes off of adversaries) and insert the knife without stabbing yourself during a firefight because you can return the gun to battery without having to resheathe the knife can be a real life saver!