I finised my XM-177E2 to go along with my 604. I'm pretty happy with them . The E2 upper is actually just for use until my stamp comes back fot the lower. I have a coplete upper with an 11.5" barrel, forward assist and shaved bayonet lug already build and ready to go on it. I'll have to get a pic of that upper..
I added bonus pic of my GUU-5/P