Daniel Defense
Daniel Defense MFR XL KeyMod
Lightweight free-float rail with KeyMod attachment system and increased inner diameter
Quick Specs
- Price
- $308
- Weight
- 10 oz
- Brand
- Daniel Defense
- Category
- handguard
Features
- •KeyMod
- •Bolt-up system
- •Extended inner diameter
- •Multiple lengths
Capability Boosts
Recommended For
+2 more
Compatibility Tags
Overview
The Daniel Defense MFR XL (Modular Float Rail XL) utilizes the KeyMod attachment system for weight savings and superior cooling compared to quad rail designs. The "XL" designation indicates an increased internal diameter designed to accommodate suppressors with proper clearance for installation and heat dissipation.
Built from aircraft-grade 6061-T6 aluminum with Mil-Spec Type III hard coat anodizing, the MFR XL features Daniel Defense's patented bolt-up mounting system for rock-solid attachment. KeyMod attachment points are located on the sides, bottom, and upper 45-degree positions, while an uninterrupted MIL-STD 1913 Picatinny rail runs the full length of the top for optics and backup sights. Anti-rotation tabs come standard for proper alignment during installation.
The catalog baseline is the discontinued 15.0-inch KeyMod rail, SKU 01-107-15042, with a 15.304-inch actual rail length and 1.61-inch inside diameter. Compatible with pinned low-profile gas blocks on pistol, carbine, mid-length, or rifle-length gas systems.
Key Features
- KeyMod attachment system for weight savings
- Aircraft-grade 6061-T6 aluminum construction
- Mil-Spec Type III hard coat anodized finish
- Patented bolt-up mounting system
- Increased internal diameter for suppressor clearance
- Full-length uninterrupted Picatinny top rail
- Discontinued 15.0-inch KeyMod rail baseline
Pros
- +Lightweight compared to quad rail alternatives
- +Extended inner diameter accommodates most suppressors
- +Large inside diameter helps suppressor-tuck or clearance-focused builds
- +Patented bolt-up system provides excellent rigidity
- +Daniel Defense quality and warranty
- +Anti-rotation tabs ensure proper alignment
Cons
- −KeyMod is legacy—M-LOK now industry standard
- −Fewer accessory options vs. M-LOK or Picatinny
- −Discontinued direct from Daniel Defense
- −KeyMod requires specific accessories
- −No integrated QD sling points
Detailed Specifications
- Material
- Aircraft-grade 6061-T6 aluminum
- finish
- Mil-Spec Type III hard coat anodized
- railLength
- 15.304 inches
- weight
- 10.00 oz rail / 12.90 oz installed with mounting hardware
- width
- 1.82 inches
- height
- 2.163 inches
- Inner Diameter
- 1.61 inches
- mountingSystem
- Patented bolt-up system
- attachmentSystem
- KeyMod
- Top Rail
- Uninterrupted MIL-STD 1913 Picatinny
- gasSystemCompatibility
- Pistol, carbine, mid-length, rifle
- antiRotationTabs
- Included
- madeIn
- USA
- color
- Black
- sku
- 01-107-15042
- status
- Discontinued by Daniel Defense
Compatible Platforms
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Primary Weapons Systems
PWS MK111 MOD 2-M Rifle .223 Wylde (SBR)
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Build Your Custom Configuration
Add the Daniel Defense MFR XL KeyMod to your build and see how it enhances your platform.