kac quad rail No Further a Mystery
Side mounted method using an built-in MILSTD 1913 rail piece for sighting techniques. Designed for use with the M203. Two fireplace Command groups exist to the M4 loved ones, the 3-round burst to the baseline design and also the entirely automated to the M4A1.[52] Some M4A1 may perhaps also have a heavier profile barrel at first designed for SOCOM