The Daniel Defense MK18 RIS II is designed to specifically to make a replica MK18 CQBR.
The Daniel Defense RIS II allows the M203 grenade launcher to free float without additional parts. As importantly, special tools are not required to mount the M203 grenade launcher. This was accomplished by integrating all of the needed parts to free float the M203 into the rail itself.
Size: 9.5" (241 mm)
The real steel Daniel Defense Rail Interface System (RIS II) was originally designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD II program. SOCOM had a specific requirement for a free float M203 solution and Daniel Defense responded, designing a revolutionary product to meet the government’s need.