I like having an SBR upper (9" barrel) and using the AAC 762-SDN-6 when I want to shoot suppressed. The integral upper in 300BLK just doesn't appeal to me.
I was considering an integral suppressor as well, but I will have 3 or 4 different firearms that I'd like to be able to suppress so using a .30 can that I can move from one firearm to another (being 5.56, 300BLK, .308) makes more sense