Mk18 Mod1 Upper Receiver Group Daniel Defense (URG) - factory BLK

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Daniel Defense Mk18 factory upper receiver group - black

This is the Mk18 Mod1, Daniel Defense model

Nowhere else, but at Charlie's does the Daniel Defense Mk18 Upper Receiver clone 10.3" URG get the respect it deserves.  Daniel Defense has held true to the design of the Mk18 rail, the 9-1/2" RIS rail, now in black, which was the original Mk18 rail.  Daniel Defense now provides us with a reasonable representation of the original Mk18 upper, with a few commercial licenses.

The Daniel Defense MK18 Complete AR-15 Upper Assembly is a faithful recreation of the US Navy's Mk18 Mod 1 platform, and features a Premium 10.3" Cold Hammer Forged Barrel made from Mil-Spec 4150 Chrome-Moly Vanadium Steel;  Chrome Lined for durability and corrosion resistance. M4 feed ramps are incorporated into the barrel extension and upper to enhance reliable feeding, while a true 5.56mm NATO chamber ensures that both commercial and higher pressure surplus mil-spec ammunition may be safely used. The bolt and carrier both pass a thorough Magnetic Particle Inspection (MPI) test for guaranteed structural integrity, and the gas key is properly staked to its mil-spec bolt carrier.

This upper has the improved fully Nitrided bolt carrier and bolt. All steel BCG parts feature a full Nitride or Melonite finish and the steel barrel features heavy mil-spec phosphate coating for superior corrosion resistance and durability, while aluminum parts are Type III Hard Coat Anodized.

This upper comes equipped with a 9.5" Black RIS II Mk18 Quad-Rail Handguard that covers a pinned, low profile gas block at the carbine gas port position and Free Floats the barrel for increased accuracy potential. The RIS II provides ample room for adding tactical accessories, while also creating a full length, uninterrupted top rail surface with the A4 Flat-Top receiver that can accommodate a shooter's chosen optic and/or iron sight arrangement. Complete with charging handle assembly and Daniel Defense Flash Hider, the MK18 upper is ready to drop onto any pistol or registered SBR small pin lower receiver. .

Technical Information:

  • Upper Receiver: DD branded* A4 Flat-Top
  • Barrel: 10.3" DD barrel
  • Barrel Contour: M4 Government
  • Barrel Material: 4150 Chrome Moly Vanadium, Cold Hammer Forged
  • Muzzle Thread Pattern: 1/2"-28
  • Chrome Lined: Yes
  • Barrel Finish: Mil-Spec Heavy Phosphate
  • Twist Rate: 1 in 7"
  • Chamber: 5.56x45mm NATO
  • M4 Feed Ramps: Yes
  • Muzzle Device: Daniel Defense Flash Hider
  • Charging Handle:  Mil-Spec Charging Handle***
  • Gas System Length: Carbine
  • Gas Block Diameter: 0.70"
  • Handguard: RIS II Mk18 Quad Rail, Free Float, Anodized in Black
  • Sights: None
  • Bolt Carrier Assembly Included: Yes, 8620 steel with Type 8 staked fasteners
  • Bolt Carrier Type: Mil-Spec, fully modern Nitride finished
  • Bolt: nitrided mil spec 9310 heavy carbon steel
  • Includes Low Profile Gas Block**
  • Weight: 3 lbs, 8.0 oz

Other options, upgrades

  • rail covers are a modern black heat resistant cover.  If you want the more traditional FDE "ladder covers" you can buy those here
  • charging handle is older standard Daniel Defense mil-spec charging handle. 
  • If you would like the newer "Rip and Grip" you can add that here

** The low profile gas block is smaller than the Mk12 gas block.  See pics for details This comes pinned or unpinned, however the factory is producing when you order.  From time to time the factory sends with the Mk12 gas block.  If you have a preference, let us know, but mostly, we get what we get.

*** Standard mil spec charging handle, which has been standard with DD Mk18's for years.  The newer Rip and Grip, which is an upgrade option at Charlie's.

Note:  This upper receiver groups ships with a milspec nitrided bolt carrier group, as many of Charlie's customers have requested this newer feature.  You can also elect to receive the Daniel Defense branded phosphated BCG as an option, if you prefer.

Read a review in The Truth about Guns .

Please feel free to ask questions before you buy.

All NFA laws apply.  If you are uncertain if you can own this, check federal National Firearms Act, also with your state authorities.  I am not your lawyer.  You need to make sure you can own it.

Note:  All ITAR regulations apply.  Charlie's deals in the real McCoy.  Your item most likely has parts that cannot be shipped outside of the USA, or owned in the USA by non-US Persons.  You take accountability to safeguard parts and the entire upper, and get necessary approvals to transport outside of the USA.