This is something that has been around for at least 1.5 years now, but I have never heard of it. The images look like they might have been from SHOT show 2011, or some defense industry show later that spring perhaps. The penetrator-type projectiles are meant to shoot underwater, from air to water, or from water to air in either .50BMG or 7.62x51:
Matt, we had them here:
Thanks, I missed that one. I wonder where they are at now with development?
I assume they are still trying to market it and probably delivered lots of test ammo to all interested. Evaluation and perspective orders may still take a while.
Just my thought.