I really see no purpose for that gun, it is basically a screwed up Land Warrior system. Land Warrior actually has a purpose though, between the fancy computer gizmos, thermal/night vision/low light optics and the camera linked to the eye piece... what else do you need? Maybe a DVD of Saving Private Ryan playing through the eye piece for a little moto when clearing some village in a place ending in -stan.
Just seems like a waste and will lead to complacency from soldiers to rely on technology too much. They would get so used to using the camera that when it came time to use it and it didn't work, they'd freeze up. Marksmanship is still the name of the game, making the gun more like a video game doesn't help.
Still, a brilliant piece of engineering to get that designed.