It turned out the weapon in question is The Nail. And pretty much, that is what it is. Up to 9 inches of steel ground to a very sharp point and not subjected to heat treatment. It's then paired with a dead simple kydex sheath with paracord looping. You can slip the Nail in its sheath through a single column of standard MOLLE webbing and tie it into place. Nothing to break.
So what are these used for? Well, the instruction manual is simple: "Insert pointy end into assailant. Repeat as necessary." It's a last ditch, close combat tool specifically designed to make the bad guy want to get off of you as quickly as possible, or die trying.
I can easily see slipping one of these behind a pouch on my chest rig for those inevitable close encounters. I wouldn't want to have to rely on one of these to finish off a zombie, but it's better than empty hands, and I'm pretty sure I can force into the brain case if I have to. It should strike primordial terror into the hearts of Vampires -- while wooden stakes are the Hollywood mainstay, railroad spikes and coffin nails have also been used to equal effect historically. This thing looks close enough to match.
Available at Blue Line Gear http://www.bluelinegear.com/p-427-strider-lm-nail.aspx and Monkey Edge http://www.monkeyedge.com/Strider_Knives_Fixed_LM_Nail_p/sk0437.htm.