Daniel Defense M4A1 FSP Rail Interface System (RIS) II - 01-004-08030-006 Black

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Daniel Defense M4A1 FSP Rail Interface System (RIS) II - 01-004-08030-006 Black

Quick Overview

SKU: 6258
UPC: 815604010313
MFR#: DD-8030-BK

SKU: 01-004-08030
Restricted Shipping: No
Manufacturer Number: 01-004-08030
NSN: 1005-01-566-5280
Product Weight: 17.1 oz
Rail Length: 12.25"
Width: 2.23"
Inside Diameter: 1.15"
Barrel Nut: Patented Bolt-up System - Steel
Gas System Length: Carbine
Free Float: Yes
Continuous Upper Rail: Yes
Integrated Sling Swivel Attachment Point: No
Manufacturer: Daniel Defense

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Daniel Defense is the Sole Source Provider of the RIS II to the United States Special Operations Command!

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 M4A1 FSP feature a cut-out in the top rail to accommodate a standard front sight base on a carbine-length gas system.

NSN # 1005-01-566-5280

The Daniel Defense RIS II free-floating picatinny rail systems are designed to allow individual operator to quickly, and without special tools, mount M203 Grenade Launcher and precisely mount SOPMOD accessories to 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 or any authorized distributor.


  • 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

Precision CNC machined from Aircraft Grade Aluminum and Military Specification in SOCOM approved Flat Dark Earth.

  • Material: Aircraft Grade 6061-T6 Aluminum
  • Finish: Military Specification Flat Dark Earth
  • Length: 12.25"
  • Width: 2.23"
  • Weight 17.1 Ounces
  • Inside Diameter: 1.15"
  • Made in the USA!

Installation Requirements

Our Bolt-Up System™ Barrel Nut Wrench is required for installation

Warranty Statement

All Daniel Defense rail systems carries a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense rail system shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your rail system in the most expeditious and inexpensive 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.

SKU: 6258
SKU 6258
Brand Daniel Defense
SKU: 6258

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