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Questions & Answers
Does this include the barrel nut wrench? Expert Answer

Unfortunately Daniel Defense does not list whether this handguard comes with the barrel nut wrench and we do not offer it on our website. You would need to source it directly from Daniel Defense.

by Armando R., Gear Expert, March 25, 2020
Would this fit an S&W Volunteer AR10? Expert Answer

The Daniel Defense M4A1 FSP Rail Interface System RIS II will not fit the M&P10.

by Hunter, Gear Expert, August 30, 2023
Customer Reviews
Helpful Positive Review
No bull, the only PROVEN rail. by Andy, Verified Owner, May 21, 2023
There is nothing wrong with other manufactures rails. Buy what you like. The truth is these DD M4 and MK18 rails earned their reputation on the battlefield. They are heavy, bulky and the mounting system is “old” by todays standards. But the mount...
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2/2 found this helpful
Helpful Positive Review
Great Rail for your Block II build! by Brando, Verified Owner, February 12, 2021
Installed in conjunction with a Colt 14.5” SOCOM heavy barrel. Attaches to the receiver nicely, retains your FSP, plenty of space for attaching extras, etc. Was my first DD rail and bought for a specific purpose, but after installing and handling it,...
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2/2 found this helpful
Helpful Positive Review
Top Tier Rail by rottensuushi, Verified Owner, August 13, 2022
Rock solid lockup, aesthetically pleasing, and exactly what you need if you're doing a block II build! Its built like a tank, lets you retain your FSP if you already have an upper or barrel with one, however bear in mind quality comes at a price, and...
Read More...
1/1 found this helpful
Most Recent Reviews
best hanguard by jswizzle, Verified Owner, July 22, 2025
Best handguard ever created. Yes the barrel nut wrench comes in the package. I mated this to a contract overrun 11.5 inch dd upper, placed a Hera arms linear comp and everything fits and looks exactly as I intended.
Most Recent Reviews
Daniel Defense ris ll fsp rail by Sheldon Sanderson, Verified Owner, February 15, 2025
Arrived in excellent condition just what I needed for my block ll build
Most Recent Reviews
Looks good and high quality by Jacob, Verified Owner, December 25, 2023
Fit on my sw mp15 pretty easily. It's solid. Would recommend.
Read All 6 Reviews

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Product Info for Daniel Defense M4A1 FSP 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 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.image

Specifications for Daniel Defense M4A1 FSP Rail Interface System RIS II:

Manufacturer: Daniel Defense
Gun Make: AR Platform
Gun Model: M4A1
Gun Type: Rifle
Handguard Length: 12.25 in
Gun Rail: Picatinny
Weight: 17.1 oz
Condition: New
Included Accessories: Standard
Height: 2.25 in
Quantity: 1
Width: 2.23 in
Length: 12.25 in

Features of:

  • Aircraft Grade 6061-T6 Aluminum
  • 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
  • Mil-Spec Type III Hard Coat Anodized Finish (FDE or Black)
  • Inside Diameter: 1.15"
  • Barrel Nut: Steel (For Patented Bolt-Up System)
  • Gas System: Carbine

Package Contents:

  • Daniel Defense M4A1 FSP Rail Interface System RIS II

Daniel Defense M4A1 FSP Rail Interface System RIS II Orderable Models

List of Orderable Models

  • Daniel Defense M4A1 FSP Rail Interface System II, 12.25in 2-Piece Handguard, Flat Dark Earth, DD-8030 , MPN: 01-004-08030 , UPC: 852548002509 , Code: DDD-HZ-DDM4FSP-DD-8030
  • Daniel Defense M4A1 FSP Rail Interface System II, 12.25in 2-Piece Handguard, Black, DD-8030-BK , MPN: 01-004-08030-006 , UPC: 815604010313 , Code: DDD-HZ-DDM4FSP-DD-8030-BK

Daniel Defense M4A1 FSP Rail Interface System RIS II Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Daniel Defense M4A1 FSP Rail Interface System II, 12.25in 2-Piece Handguard, Flat Dark Earth, DD-8030 , MPN: 01-004-08030-EDEMO , Code: DDD-HZ-DDM4FSP-DD-8030-EDEMO-RE-C
  • DEMO, Daniel Defense M4A1 FSP Rail Interface System II, Flat Dark Earth, DD-8030 , MPN: 01-004-08030-DEMO , Code: DDD-HZ-DDM4FSP-DD-8030-DEMO
  • DEMO, Daniel Defense M4A1 FSP Rail Interface System II, Black, DD-8030-BK , MPN: 01-004-08030-006-DEMO , Code: DDD-HZ-DDM4FSP-DD-8030-BK-DEMO
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