Daniel Defense - M4A1 Rail Interface System II, RIS II (Black)

The Daniel Defense Rail Interface System (RIS II) was developed in response to a request from the United States Special Operations Command (SOCOM) for the SOPMOD II program. SOCOM required a free float M203 solution, and Daniel Defense delivered with an innovative design that integrates all necessary components into the rail system itself, allowing the M203 grenade launcher to free float without additional parts or special tools. This advanced system is engineered to be used with the MK12 Low Profile Gas Block, ensuring superior performance in demanding conditions.

• Aircraft Grade 6061-T6 Aluminum: Constructed from high-quality aluminum for lightweight durability.
• Free-Floating Barrel Design: Enhances accuracy by preventing contact between the barrel and the handguard.
• Two-Piece Design: Specifically designed for USSOCOM, allowing the M203 Grenade Launcher to be attached when the lower rail section is removed.
• Battle-Tested Bolt-Up System: 6-bolt system securely attaches the handguard to the upper receiver, providing a reliable connection.
• Grade 8 Military Specification Fasteners: Built to withstand the rigors of combat and high-stress conditions.
• Uninterrupted Upper Rail Platform: Features Mil-Spec 1913 Picatinny rails for a wide range of accessory mounting options.
• Mil-Spec Type III Hard Coat Anodized Finish: Available in Black, offering superior protection against wear and corrosion.

Specifications:

• Product Weight: 17.7 oz
• Rail Length: 12.25"
• Width: 2.23"
• Height: 2.25"
• Inside Diameter: 1.15"
• Barrel Nut: Steel (For Patented Bolt-Up System)
• Gas System: Carbine
• Free Float: Yes
• Continuous Upper Rail: Yes
• Integrated Sling Swivel Attachment Point: No
• Manufacturer: Daniel Defense