Daniel Defense 0100408020006 MK18 RIS II Handguard 6061-T6 Aluminum Black Picatinny Rail AR-15 9.55" Long
The Daniel Defense Rail Interface System (RIS II) was designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD II program. It allows the individual operator to free-float the M203 grenade launcher without additional parts.