Facet mounted process with an integrated MILSTD 1913 rail piece for sighting devices. Made for use Along with the M203. Heatshields In Handguard – You'll find heatshields on The within of the handguard to shield the person all through extended lengths of firing their weapon. Posted by Brett H on https://kac-rail75836.thekatyblog.com/28764505/knights-armament-quad-rail-fundamentals-explained