Hand guards will vary according to which you choose to make. The URG-I For example works by using a geissele mk16 nine″ handguard which only seem to be readily available on their own freshly introduced URG-I higher receivers. This is quite redundant definitely as these primary KAC addresses are usually https://knights-armament-m4-quad31852.vblogetin.com/32175173/what-does-kac-ras-rail-mean