Aspect mounted process with the integrated MILSTD 1913 rail piece for sighting devices. Made for use with the M203. Posted by BRAD on twenty third Jan 2020 Great product, suits similar to a glove, sturdy, good and may have a beating. Took me a minute to set up it because https://knights-armament-rail98594.weblogco.com/29596636/the-5-second-trick-for-ras-m4