Side mounted program with the built-in MILSTD 1913 rail piece for sighting programs. Created for use While using the M203. This is named carrier tilt. The ALP lets the operating rod to wiggle to proper for the downward pressure on the bolt and transfers the force straight backwards consistent with https://edgarcttdp.kylieblog.com/30010182/5-essential-elements-for-knights-armament-quad-rail