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. 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.

FSP RIS II models have a cutout in the top rail that allows retention of the standard A2 gas block/front sight tower on a carbine-length gas system. MK 18 RIS II is specifically designed for an M4A1 carbine with Mk18 CQBR (Close Quarters Battle Receiver) upper receiver and 10.3" barrel.

Incredibly rigid when installed yet weighing in at just 17.7 Oz, the RIS II M4A1 free float quad rail is the perfect option for clone-correct builds or anyone looking for the toughest rail on the market. Features: Cutout for carbine-length gas systems with fixed front sight post; Designed for and adopted by USSOCOM; Quad rail design includes ...

The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. As important, special tools are not required to mount the M203 grenade launcher. This was accomplished by integrating all of the needed parts to …

M4A1 FSP ADDITIONAL STEP: With the lower rail removed, insert the front sight base and gas tube assembly into the FSP opening on the rail system. Slide the rail system, front sight base, and gas tube onto the barrel as one unit. Stop when the front sight base hits the shoulder of the barrel. Reinstall taper pins in the front sight base.

The Daniel Defense RIS II free-floating Picatinny rail systems are designed to allow individual operators to quickly, and without special tools, mount the M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of impact.

The RIS II utilizes Grade 8 Mili-Spec fasteners, and a battle-tested 6-bolt system to attach to the handguard of the upper receiver. Features: Free-Floating barrel design; Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade …

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. 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.

The Daniel Defense Rail Interface System (RIS II) has provided to US Special Operation Command (SOCOM) since 2006. This revolutionary two-piece handguard attaches to the …