FNH IAR?

General Firearms Other Semi-Automatic Rifles
1

http://www.fnhusa.com/mil/products/firearms/group.asp?gid=FNG023&cid=FNC01

2

That was entered in the Marine Corps trial for a new Infantry Automatic Rifle (IAR)

A few other contenders were Colt, LWRC, Hk, maybe KAC?

Hk’s submission won.