Daniel Defense MK18 RIS III FDE, 10.3″ 5.56 Upper Receiver Group


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Daniel Defense MK18 RIS III FDE, 10.3″ 5.56 Upper Receiver Group

The MK18 RIII Upper Receiver Group is built around a hammer-forged 10.3″ barrel and is unmatched in size, weight, and performance.

The MK18 RIII AR15 style Upper Receiver Group is unmatched in size, weight, and performance, and is built around a 10.3 inch Cold Hammer Forged M4 Profile barrel with a Daniel Defense Flash Suppressor, a GRIP-N-RIP Charging Handle, and our carbine length gas system. It features a 9.5 inch lightweight RIS III rail—modeled after the revolutionary RIS II two-piece handguard developed for SOCOM— which features M-LOK attachment for lighter weight. All Daniel Defense complete upper receiver groups come standard 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, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested
  • GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine 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
  • SIGHTS: Sold Separately
  • HANDGUARD: Daniel Defense RIS III 9.5, Patented, 6-Bolt Bolt-Up System, CNC Machined of 6061-T6 Aluminum
  • CHARGING HANDLE: GRIP-N-RIP Charging Handle, Body CNC Machined of 7076-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized
  • Made in the USA!

1 review for Daniel Defense MK18 RIS III FDE, 10.3″ 5.56 Upper Receiver Group

  1. Aaron G (verified owner)

    Rooftop Def as a company was awesome. Great price, very, very fast shipping, excellent communication, bonus ramen in the box. The DD upper is well… DD, great quality, shoots accurate and very gassy on a DD full ambi lower with an H1 and even an H2 buffer using a Sierra 5 can. Prepare for tears of freedom with this upper and a non-flow through can.

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