With many modern optics on an M4, the front sight post interferes with the sight picture. Even with co-witness optics, the front sight can be distracting and blocks the target picture. This flip up sight, styled after a real model, allows for the front sight to move out of the way. The sight also features picatinny rails which can be used to mount a separate sighting system, if needed.
This front sight gas block also features a Quick Detach sling swivel mount on each side for easy use of tactical slings.