This gun was also made for the Army University Press' (AUP) Film Team's documentary "Understanding Combined Arms Warfare" that's up on Youtube: https://www.youtube.com/watch?v=-ZOGdKANL5s&t=696s
As far as I can tell, this model wasn't used in the final product. I was told during production to make it fairly clean and that we likely wouldn't be coming too close to it, so to make it fairly basic. I didn't add the drum or any bullets, since the historian didn't deem it necessary.
According to Wikipedia, this gun was a "rather misguided attempt" at creating a lighter light machine gun. To make it easier to move, I suppose.
sketchfab link if you want to get a closer look