Side mounted technique having an built-in MILSTD 1913 rail piece for sighting systems. Made for use with the M203. Posted by BRAD on twenty third Jan 2020 Amazing solution, suits similar to a glove, strong, strong and will take a beating. Took me a minute to put in it since https://knightsarmamentdropinrail60483.qodsblog.com/29558141/the-best-side-of-knights-armament-carbine-length-quad-rail