Aspect mounted process with an integrated MILSTD 1913 rail piece for sighting methods. Made for use with the M203. This is called provider tilt. The ALP enables the operating rod to wiggle to accurate with the downward force around the bolt and transfers the drive straight backwards according to the https://kac-m4-rail38368.mpeblog.com/53064798/what-does-knights-armament-m4-quad-rail-mean