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Daniel Defense RIS II M4A1 FDE Rail Interface System Assembly 01-004-08001

SKU 01-004-08001-DD

List Price $501.00
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Government Export Restriction
This item may be regulated for export by the U.S. Department of State or the US Department of Commerce. Please see our Export Policy.


Daniel Defense's Rail Interface System or RIS II was originally designed at the request of the United States Special Operations Command (SOCOM) for SOPMOD II program. This program had a specific requirement to free float an M203 grenade launcher without additional parts, and Daniel Defense delivered. The RIS II itself features four picatinny rails in the 12 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock positions with plenty of space to mount accessories such as tactical lights/lasers, fore-grips, iron sights, and optics. 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.


  • Free-Floating barrel design
  • 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
  • Mil-Spec Type III Hard Coat Anodized Finish (FDE or Black)


  • Product TypeRifle Parts
  • Item ConditionNew
  • UPC852548002820
  • MPN01-004-08001

Customer Reviews

Average Rating
March 10, 2024

Excellent product Excellent price

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