Great little upper - Anderson Manufacturing EXT 10.5in M4 Complete Upper w/Extended Forearm

Fit my Rock River lower perfectly. No rattle or flex. Well over five hundred rounds through it now and it goes bang every time with zero malfunctions. It has a heavy barrel, which makes it extremely accurate but your not going to see much in weight savings from a light 16” barrel. The Qd attachment holes are working great also. I definitely recommend this upper. Can’t beat it for the price!