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 M4A1 RIS II is designed to accept an M203 grenade launcher while maintaining a free-float barrel. Remove lower rail assembly by loosening and then removing four lower rail attachment screws. Place two of the lower rail attachment screws …

Its free-floating Picatinny rail systems are designed to allow the individual operator to quickly, and without special tools, mount a M203 Grenade Launcher and precisely mount SOPMOD accessories to the host weapon without effecting point of impact.

Designed at the request of USSOCOM to provide M203 compatibility while still providing a free float rail system, the Daniel Defense RIS II AR-15 Quad Rail Handguard meets this requirement without the need for special tools.

The Daniel Defense RIS II M4A1 freefloat handguard is one of the toughest and most effective rail systems for AR-pattern rifles available on the market to date.

The Daniel Defense RIS II is an absolutely solid rail for your AR. Once it’s on, it’s on and not moving around. Yes it’s heavier than your current m-lok rail but still nothing beats a solid quad rail in terms of rigidity.

Discover the Daniel Defense M4A1 5.56 Rifle with a 14.5" cold hammer-forged barrel, RIS II quad rail, and ambidextrous controls. Built for performance!

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 M4A1 AR15 style firearm features the RIS II picatinny quad rail, which has been in use by US Special Operations Command (SOCOM) for the SOPMOD Block II program since 2005. The M4A1 is built around a 14.5 inch Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Flash Suppressor.