I purchased this upper, as soon as I received it I placed my open sights and red dot on it. I immediately then went to the range and put 110 rounds down range. Only took 15 rounds to sight both sighting systems in,the rest was to just run for function. I had more injoyment using it. I am impressed with the quality and looks of the upper.
Reviewed by: Robert VanDyke from Lowville,NY on 6/19/2019