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Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt FDE
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
Mk18 10.3" Upper Receiver 5.56 1-7 Govt Black
None
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DANIEL DEFENSE - MK18 5.56 UPPER RECEIVER GROUP COMPLETE

4 Reviews
Color
Brownells #
100014992, 100023304
MFR #
23-004-08013-011, 23-004-08013-006
UPC
852548002592, 815604014045
$1,527.00
Coupon Code ARBUILD12
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What is the DANIEL DEFENSE - MK18 5.56 UPPER RECEIVER GROUP COMPLETE?

The Daniel Defense MK18 Upper Receiver Group features the railed forend Daniel Defense currently provides to USSOCOM and a 10.3” Cold Hammer Forged Barrel. The MK18 Rail Interface System (RIS II) features the Bolt-Up System has been rigorously tested prior to fielding by USSOCOM. The 10.3” barrel is the same length in use for the MK18 upper most often used for CQB operations. The new independently ambidextrous GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters and is engineered for suppressed fire, with anti-gas features that redirect gas flow upward and away from the face and operator. All Daniel Defense complete upper receiver groups come standard with an M16 profile bolt carrier group. Available with either black or FDE handguards.

  • 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 II MK18, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized
  • 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
  • RAIL PANELS: Daniel Defense Rail Panels Made from Santoprene, Heat Resistant to 300° F.
  • Made in the USA!

It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws.

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MK18 5.56 UPPER RECEIVER GROUP COMPLETE REVIEWS

5.0
4 Reviews
5 Stars
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5
MK18 Build goes crazy
My first time taking this out and shooting it and ran over 600 rounds through this upper and it ran flawlessly. DD is a win as always
Would you recommend this? Yes, I would recommend to a friend
by JACK K. on August 30, 2025
Verified Purchase
Was this review helpful? 1
5
An absolute work of art!
Pure craftsmanship at its finest! The name DD speaks for itself and the MK18 upper certainly lives up to that reputation. This upper snapped right on to (and fit perfectly) my DD .300 Blackout pistol lower and operated flawlessly. There's a reason why these uppers are so difficult to get your hands on...they're AWESOME! I've owned ARs of much less quality (entry level) and after owning a DD, I will never go back. I'm a DD fan for life!
by Budddyintx on April 09, 2021
Was this review helpful? 4
5
MK18
Quality product that you would expect from Daniel Defense. No scratch or dings that I can find. Comes with ambi charging handle. Shipping was fast on Brownells end, Fedex got delayed for a couple of days but overall it was pretty fast turn out. Have not shot it yet because im waiting on my lower to come in. tough times we live in. lol.
by Rice i. on April 08, 2021
Was this review helpful? 1
5
Brownells For The Win
Brownells Had This In Stock When It Was Out of Stock Everywhere Else, And At A Lower Price Than Anywhere Else.. Shipped Quickly And Well Packaged.. 5 Stars !!
by Constantine on August 21, 2019
Was this review helpful? 1
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