PCP Ammunition 6.8 mm Polymer Composite Case Cartridge For Next Generation Squad Weapons (Not Chosen By The Army)

This cartridge was first mentioned on the Forum here:

PCP’s cartridge and the weapon system did not make it when the U.S. Army recently narrowed down the field of companies competing for the NGSW (New Generation Squad Weapon) from five to three.

None the less here is another photo of the PCP 6.8mm cartridge and associated box, photo is from: