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.
This rail by Daniel Defense is robust and is perfect for anyone looking to ensure their AR is solid and built like a tank. US SOCOM picked this rail for a reason. Don't hesitate on getting this rail in any of its variations.