Daniel Defense M4A1 FSP Rail Interface System II - Carbine Cut - 12.25in - Flat Dark Earth

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Daniel Defense M4A1 FSP Rail Interface System II - Carbine Cut - 12.25in - Flat Dark Earth

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 important, 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 FSP RIS II features a front sight pocket (FSP) to accomodate an A2 Front Sight Base.  Your barrel must be drilled for a carbine length gas system in order to work with the FSP RIS II.  The benefit of the 12 o'clock rail in front of the FSB allows for mounting weapon lights or lasers for ambidextrous activation.  

  • Free-Floating Barrel Design For Increased Accuracy
  • Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed.
  • Battle-Tested, 6-Bolt Bolt-Up System Securely Attaches Handguard to the Upper Receiver
  • Grade 8 Military Specification Fasteners
  • Uninterrupted Upper Rail Platform & Mil-Spec 1913 Picatinny Rails
  • Weight:  17.1 oz 
  • Width:  2.23"
  • Height:  2.25"
  • Inside Diameter:  1.15"  
  • Gas System:  Carbine
More Information
Dangerous GoodsYes
Shipping RestrictionITAR/Export Restricted
Barrel RestFree Float
ColorFlat Dark Earth
FinishType III Class 2 Hardcoat Anodized
Material6061-T6 Aluminum
Mounting InterfacePicatinny
Weapon ModelAR-15/M-16
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