 On the early model shotgun the 10A, the upper plastic section also housed the built-in flashlight and carrying handle.The later model shotgun the 10B was improved with a left-hand charging handle, flip-up front sight, and utilized the new flashlight mount/carrying handle mounting block (which doubles as the carrying handle mount) as the rear sight.The "Kel-Lite" branded flashlight can be removed, as it is attached to the aforementioned mounting block.