|Manufacturing # / SKU
||Steel (For Patented Bolt-Up System)
|Gas System Length
|Continuous Upper Rail
|Integrated Sling Swivel Attachment Point
M4A1 Rail Interface System (RIS) II
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 RIS II allows the individual operator to free float the M203 grenade launcher 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. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. 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. The Daniel Defense RIS II is an innovative upgrade to the M4 platform and is available for commercial purchase directly from Daniel Defense.
- Free Floating Barrel Design
- Uninterrupted Upper Rail Platform
- Aircraft Grade Aluminum
- Hardened Steel Barrel Nut
- Grade 8 Military Specification Fasteners
- Mil-Spec 1913 Picatinny Rails
Materials & Construction
Our Bolt-Up System Barrel Nut Wrench is required for installation
All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer’s products. Be sure to retain your sales slip as proof of purchase date when making a claim.