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Questions & Answers
What length MFR Rail would i need to swap out on my ris II mk18 ? Expert Answer

You would need the 9" Daniel Defense MFR XL Rail Systems.

by Hunter, Gear Expert, March 28, 2023
Does anyone know if this would work with the Adams Arms P-Series Pistol Length upper? Ay modifications required? Thank you! Expert Answer

The Daniel Defense MFR XL Rail Systems are not listed as being compatible by Adams Arms. I recommend contacting Adams Arms to confirm compatibility.

by Hunter, Gear Expert, April 21, 2023
Customer Reviews
Helpful Positive Review
Great rail by Kyle Carson, Verified Owner, June 30, 2020
I am a DD fan so when swapping out for a larger rail that would fit a suppressor this was my first choice. Super easy to install and fits perfect. The M-lok design is very lightweight. Weighs less than the previous rail even though this one is wider ...
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1/1 found this helpful
Helpful Positive Review
One of the best rails by psg127, January 25, 2019
Excellent rail at a decent price. Fit & finish was superb, DD should’ve included at least 1 mlok pic rail. Very lightweight & aesthetically appealing. The overall girth of the rail would be good for most hands, bigger hands could opt for the XL versi...
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1/1 found this helpful
Helpful Negative Review
better qc needed by j-dizzle, Verified Owner, November 3, 2023
-better installation instruction are needed. Had to contact DD for assistance. -better QC is needed. Anodizing splotch defect on a $230 rail. - DD customer care sounded generally annoyed. Had a tone like i was dumb for having questions. That’s how...
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1/1 found this helpful
Most Recent Reviews
wrong size advertise by Bernardo Orozco, Verified Owner, November 2, 2025
They advertise it’s a 15.5 handguard but It’s not it’s a 15in handguard
Most Recent Reviews
Sturdy American Made Part by JCS, Verified Owner, October 2, 2025
I bought this to fit it over a suppressor. It is slightly the right internal diameter, but it's TIGHT. Make sure you get a slim or long can if you want to fit it.
Most Recent Reviews
good looking rail by Fitzgerald, Verified Owner, April 24, 2025
DD makes a good looking rail, no surprise there. I will say the mfr xl rail did claim it could accept a suppressor which was not true for the Dead air sand man x. The can would hit the rail before it could lock up properly. I wound up getting a 10" ...
Read More...
Read All 10 Reviews

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Product Info for Daniel Defense MFR XL Rail Systems

The MFR XL Rail Systems from Daniel Defense utilize the Keymod and M-LOK attachment systems for incredible weight savings as well as superior cooling, ergonomics, and modularity while maintaining the strength and durability expected from Daniel Defense. Keymod attachment points are located on the sides, bottom, and upper 45 positions of the rail while featuring an uninterrupted 1913 Picatinny rail on top. M-LOK attachment points are located along 7 positions on the rail and feature an uninterrupted 1913 Picatinny rail on top. Its sleek bolt-up system increases strength and allows for easy installation. The increased internal diameter gives the operator the ability to attach a suppressor and have the proper clearance needed for installation. Anti-rotation tabs come standard for ease of installation and alignment. The MFR can be used with a pinned low-profile gas block on pistol, carbine, mid-length or rifle length gas systems.image

Specifications for Daniel Defense MFR XL Rail Systems:

Manufacturer: Daniel Defense
Color: Black
Finish: Military Specification Type III Hard Coat Anodized
Fabric/Material: Aircraft Grade 6061-T6 Aluminum
Gun Make: AR Platform
Gun Model: AR-15
Gun Type: Rifle
Gun Rail: Picatinny
Condition: New
Included Accessories: Standard
Mount Type: M-LOK
Quantity: 1

Features of:

  • Light Weight Free Floating Barrel Design
  • Steel Barrel Nut
  • Uninterrupted Mil-Spec 1913 Picatinny Upper Rail
  • M-LOK or Keymod attachments on the sides and bottom
  • Patented Bolt-Up Mounting System
  • 1.61" internal diameter designed for use with suppressor
  • Weight Installed = 13.30 oz (with Mounting Hardware)

Package Contents:

  • Daniel Defense MFR XL Rail System

Daniel Defense MFR XL Rail Systems Orderable Models

List of Orderable Models

  • Daniel Defense 9in MFR XL Rail Systems w/ M-LOK attachments, Black, 01-107-08094 , MPN: 01-107-08094 , UPC: 818773020114 , Code: DDD-HZ-MFRXL-01-107-08094
  • Daniel Defense 10in MFR XL Rail Systems w/ M-LOK attachments, Black, 01-107-08198 , MPN: 01-107-08198 , UPC: 818773020121 , Code: DDD-HZ-MFRXL-01-107-08198
  • Daniel Defense MFR XL 15.5 M-LOK Rail, Black, 01-107-09195 , MPN: 01-107-09195 , UPC: 818773020145 , Code: DDD-HZ-MFRXL-01-107-09195
  • Daniel Defense 13.5in MFR XL Rail Systems w/ M-LOK attachments, Black, 01-107-08246 , MPN: 01-107-08246 , UPC: 818773020138 , Code: DDD-HZ-MFRXL-01-107-08246

Daniel Defense MFR XL Rail Systems Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Daniel Defense 10in MFR XL Rail Systems w/ M-LOK attachments, Black, 01-107-08198 , MPN: 01-107-08198-EDEMO , Code: DDD-HZ-MFRXL-01-107-08198-EDEMO-IN-C
  • Daniel Defense MFR XL KeyMod Rail System, 10in, 01-107-01203 , MPN: 01-107-01203 , UPC: 815604019859 , Code: DDD-HZ-MFRXL-01-107-01203
  • Daniel Defense MFR XL KeyMod Rail System, 9in, 01-107-14192 , MPN: 01-107-14192 , UPC: 815604019880 , Code: DDD-HZ-MFRXL-01-107-14192
  • Daniel Defense MFR XL KeyMod Rail System, 13.5in, 01-107-10233 , MPN: 01-107-10233 , UPC: 815604019866 , Code: DDD-HZ-MFRXL-01-107-10233
  • Daniel Defense MFR XL KeyMod Rail System, 15in, 01-107-15042 , MPN: 01-107-15042 , UPC: 815604019873 , Code: DDD-HZ-MFRXL-01-107-15042
  • USED, Daniel Defense MFR XL 15.5 M-LOK Rail, Black, 01-107-09195 , MPN: 01-107-09195-EDEMO , Code: DDD-HZ-MFRXL-01-107-09195-EDEMO-RE-B
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