Facet mounted program with an integrated MILSTD 1913 rail piece for sighting systems. Made for use with the M203. Some great benefits of these alterations, nonetheless, have arrive underneath scrutiny from the two the navy and civilian firearms community.[34] According to a PDF detailing the M4 Carbine enhancement options launched https://kac-quad-rail85173.ssnblog.com/28993249/the-definitive-guide-to-ras-m4