Side mounted program by having an built-in MILSTD 1913 rail piece for sighting systems. Suitable for use Using the M203. Posted by BRAD on 23rd Jan 2020 Magnificent item, matches similar to a glove, durable, good and can take a beating. Took me a minute to install it mainly because https://m4-ras-rail41740.ivasdesign.com/51592947/indicators-on-kac-ras-m4-you-should-know