Heard about a new Optic replacement for ACOG for Rifleman, that provided an AR overlay so I assume eMagin. It's in the Portfolio but couldn't find it in the budget. eMagin OEM Trijicon would supply. Anyway in doing so I came across this

Banc3 prism for , are you sitting down Derrick?, Optical See-Through. Also whatever happened to PAWS?

Free-form Prism Eye Piece

BANC3 developed the Free-form Prism Eye Piece by using innovative design principles to design and manufacture a new breed of free-form prisms for optical-see-through HMD. The prism is designed to work with the newest high-resolution color AMOLED micro-displays to advance the current state of the art in optical-see-through HMDs.

http://www.banc3.com/Capabilities/Research-and-Development.aspx