Complete BCM factory upper in .300 Blk with 9” cold hammer forged chrome lined barrel. This is not pieced together—it was purchased directly from BCM as a complete upper. Comes with the BCM bolt carrier group and oversized charging handle. The muzzle device is a brake with a QD for a YHM suppressor (I think it fits other suppressors as well, but not sure which). Maybe 200 rounds fired. I just put this on a standard BCM lower with the H1 buffer and it ran great suppressed and unsuppressed. Shoots great, I just decided I’d rather have a 5.56 upper.