This M4 Barreled Upper Assembly is complete and ready for you to add your choice of Optics or Rear Sights. The highly accurate 11.5” M4 profile barrel is chrome lined and machined from 4150 Chrome Moly Vanadium steel - rifled 1 x 7 Right Hand twist. An A2 Flash Suppressor and standard A2 F-Marked Front Sight are fitted. The barrel is the heavy M4/SOCOM style with M203 flats.
The 11.5" barreled upper is for Pistol or SBR use only.
The Knights Armament Rail Interface System (RIS) was designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD program. It allows the individual operator to free-float the M203 grenade launcher without additional parts.