Hand guards will change based upon which you choose to build. The URG-I As an example uses a geissele mk16 nine″ handguard which only appear to be offered on their own newly unveiled URG-I higher receivers. Installation was easy and simple, excellent design and style. Only had to use just https://knights-armament-rail64063.thezenweb.com/not-known-factual-statements-about-knights-armament-rail-64375184