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Questions & Answers
Will this fit on a diamond back DB-10?

No. The DB-10 is an AR10, not a AR15 or M4 variant. This is not compatible.

by Eric, Verified Owner, November 4, 2019
Customer Reviews
Helpful Positive Review Solid Rail by C.S., Verified Owner, February 28, 2021
The Daniel Defense RIS II is an absolutely solid rail for your AR. Once it’s on, it’s on and not moving around. Yes it’s heavier than your current m-lok rail but still nothing beats a solid quad rail in terms of rigidity.
1/1 found this helpful
Helpful Positive Review Daniel Defense M4A1 Rail Interface System by Legacy Reviewer, September 22, 2013
the very BEST rail system on the market! you can never go wrong with Daniel Defense. you may pay a bit more, but you will be very satisfied with it. best of all, I got it installed under 30 minutes. installation was very easy. Pros: Very Easy to in...
Read More...
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Most Recent Reviews RIS II RAIL by LarkMaines, Verified Owner, April 10, 2025
Love it. Haven’t built a quad railed AR in a while. What can I say about it…. It’s Daniel Defense
Most Recent Reviews Great heavy duty rail system for socom barrel. by C.mar., Verified Owner, July 2, 2024
For does wanting to build an m4a1 style rifle, this is a must. Fit perfectly with heavy barrel and mk12 gas block. Installation is not hard.
Most Recent Reviews Bomb Proof by C88, Verified Owner, March 13, 2024
If you are looking at this rail, chances are you already know of its reputation. It's a rock solid rail that lives up to the hype. It's an older design obviously and it's larger and heavier than mlok rails, but it has ZERO flex and is built like a ta...
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Most Recent Reviews ris 2 rail by Matt Mcquate, March 9, 2024
I love my ris 2 rail. It looks great has great lock up and was lighter than I expected. My only problems were that the barrel nut wrench barely fit onto the barrel nut so when installing that I was stripping out the barrel nut lugs a little and the s...
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Read All 8 Reviews

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Product Info for Daniel Defense 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 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 Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block.image

Specifications for Daniel Defense M4A1 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: 17.7 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)

Package Contents:

  • Daniel Defense M4A1 Rail Interface System RIS II

Daniel Defense M4A1 Rail Interface System RIS II Orderable Models

List of Orderable Models

Daniel Defense M4A1 Rail Interface System II, Flat Dark Earth, DD-8001 , MPN: 01-004-08001 , UPC: 852548002820 , Code: DDD-HZ-DDM4A1RI-DD-8001
Daniel Defense M4A1 Rail Interface System II, Black, DD-8001-BLK , MPN: 01-004-08001-006 , UPC: 852548002561 , Code: DDD-HZ-DDM4A1RI-DD-8001-BLK
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