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Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE


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Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE


The DD4 RIII Upper Receiver Group offers the longest barrel length of the RIII family and is perfect for popular shooting sports and for tactical defensive applications. Built around a 10.3 inch Cold Hammer Forged Government Profile barrel, its mid-length gas system is known to have a smoother recoil impulse.

A 9.5 inch lightweight RIS III rail—modeled after the revolutionary RIS II two-piece handguard developed for SOCOM—free-floats the barrel and features M-LOK attachment for lighter weight. It has our ambidextrous Grip-N-Rip Charging Handle and ships with an M16 Profile bolt carrier group.


  • UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
  • BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 10.3" Government Profile, Carbine length Gas System, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested
  • GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 Hardened Steel and Mil-Spec Heavy Phosphate Coating, Mid-length, Direct Impingement
  • MUZZLE DEVICE: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished
  • BOLT CARRIER GROUP: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key
  • HANDGUARD: RIS III 9.5", Patented 6-Bolt Bolt-Up System, CNC Machined of 6061-T6 Aluminum, FDE Type III Hard Coat Anodized
  • CHARGING HANDLE: GRIP-N-RIP Charging Handle, Body CNC Machined of 7075-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized


  • Barrel Material: 4150 Chrome Moly Vanadium
  • Barrel Type: Cold Hammer Forged
  • Barrel Profile: Government
  • Rifling Twist: 1:7"
  • Gas System Length: Carbine
  • Muzzle Device: Flash Suppressor
  • Weight: 3.545 LBS
  • Rail System: RIS III 9.5" (M-LOK)
More Information
SKU 23-004-81721-011
Product Type Handguard
Manufacturer Daniel Defense
Twist Rate 1:7
Color Flat Dark Earth
Gas Length Carbine
Rail Length 9.5"
Mount M-LOK
Barrel Length 10.3"

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