X Products Billet Assembled Side Charging Upper Non Reciprocating

True drop in system that allows the use of a Mil standard bolt without machine modification. Only change you make is to install a special Cam pin into your bolt which is included with the upper. Machined and profiled to work with all M4 pattern M4 upper forend rails that are designed for use on the mil spec uppers. The left hand port is covered preventing gas from suppressor use and shrapnel from entering the shooters face when in operation. Rear of the upper is covered with a spring loaded flip up door that lifts to remove and replace your bolt. Bolt drops in and doesn't require special operation to put your charging handle in. Machined M4 feed ramps. Includes complete upper, Cam Pin and Side Mount Rail Installed.