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Daniel Defense MK18 MK18 RIII 5.56 NATO Flat Dark Earth Pistol

The Daniel Defense MK18 RIII pistol is a compact 5.56 NATO firearm built around the proven MK18 configuration. It features a 10.3-inch cold hammer forged barrel, a Flat Dark Earth finish, an ambidextrous RIII lower receiver, and a free-floating RIS III rail for consistent accessory mounting. The semi-automatic direct-impingement action supports familiar AR-style controls, while the threaded muzzle accommodates compatible devices. An optics-ready Picatinny top rail and standard sights provide flexible aiming options for close-range use.

Key features

  • 10.3-inch cold hammer forged barrel balances compact handling with 5.56 NATO performance
  • RIS III free-floating rail provides a stable platform for lights, lasers, and other accessories
  • Ambidextrous RIII controls support convenient operation from either shoulder
  • Threaded 1/2x28 muzzle accepts compatible muzzle devices
  • Optics-ready Picatinny rail supports a wide range of sighting systems
  • Includes a 32-round magazine and polymer pistol grip

The Daniel Defense MK18 RIII delivers compact, configurable 5.56 NATO performance in a factory Flat Dark Earth pistol package.

Daniel Defense MK18 MK18 RIII 5.56 NATO Flat Dark Earth: quick facts

What caliber is the Daniel Defense MK18 MK18 RIII 5.56 NATO Flat Dark Earth?
It is chambered in 5.56 NATO.
How many rounds does it hold?
32+1 rounds; magazines included: 1.
How big and heavy is it?
Barrel length 10.3 inches, overall length 27.9 inches, weight 5.7 pounds.
What kind of action does it use?
Semi-Automatic.
Is it optic ready or threaded?
Optic ready: Yes; threaded barrel: Yes.
What sights and finish does it have?
Sights: Standard Sights; finish: Flat Dark Earth.
Is it new or used?
New, in the original packaging.
Can I buy it in Idaho?
Yes. It ships to a licensed FFL dealer in Idaho; you pick it up there after the background check. Idaho buyers pick this handgun up at a licensed dealer after a NICS check, with no permit and no waiting period; dealers sell handguns from age 21 under federal law.
Is it in stock?
Yes, at $2469.04. Orders leave within 1-2 business days; shipping is free over $999.

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