Roscoe Manufacturing 14.5 barrel with Midwest Industries Rail, BCM Gunfighter charging handle, and a Roscoe bolt carrier group. I'm unsure if the bolt carrier group is the nitride version or phosphate coated/chrome lined version, I previously received this as a trade.
It's a nice upper, I just have no need of it. When going to the Roscoe website, I was quoted ~$750 to mimic this build. Please note that there is no muzzle device, so feel free to add one that works for your suppressor.