Daniel Defense MK12 5.56 Rifle 18" - DDM4 12" Quad Rail - Black

Manufactured by Daniel Defense
SKU: 02-142-13175-047
MPN: 02-142-13175-047
Manufactured by Daniel Defense
2 Reviews

Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.

Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal Firearm License holder.
•Current processing time is approximately 14 to 16 days.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers. Due to Covid-19 many are no longer open
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



When appropriate, areas with magazine capacity restrictions will receive a 10-round magazine substituted for the factory 30-round magazine.

The Daniel Defense MK12 is an evolution of the Special Purpose Rifle concept built to the Daniel Defense Mil-Spec+ standard. The heart of the rifle is an 18" cold hammer forged and bead blasted 416 stainless steel barrel. By cold hammer forging, they are able to ensure the most precise possible alignment of chamber and bore while also significantly enhancing the barrel's durability. A rifle length gas system increases dwell time and reduces felt recoil, further improving the rifle's potential for precision. To get the most from that potential accuracy, the MK12 ships from the factory with a Geissele Automatics Super Semi-Automatic 2-stage trigger.

  • Enhanced lower receiver with flared magazine well and rear QD sling swivel cup
  • 18" cold hammer forged 416 stainless MK12 barrel has been bead blasted and chemically passivated for corrosion resistance and durability
  • Smooth and reliable rifle length gas system with heavy buffer increases dwell time and minimizes felt recoil
  • MK12 gas block machined to Crane specifications for USSOCOM and black oxide coated
  • M16 cut Mil-Spec bolt carrier group with properly staked gas key and chrome lined bore
  • 12" DDM4 free float quad rail
  • Effective flash suppressor helps tame muzzle flash
  • Daniel Defense overmolded pistol grip and collapsible stock
  • Geissele SSA 2-stage trigger
  • BCM Gunfighter Mod 4 charging handle

Also included is a flared magazine well, free floated DDM4 quad rail, scope-friendly Bravo Company Mod 4 charging handle, and Daniel Defense's rugged and ergonomic furniture. If you don’t have the time to build a rifle, the MK12 is the perfect precision rifle for you as it comes with all the advanced features you could want. And you get the peace of mind knowing it was assembled from the best materials with some of the best quality control in the industry, so you don’t have to worry about it failing. Just pick your favorite optic and you are ready for the range.

Daniel Defense is a privately held firearms manufacturer located in Black Creek, Georgia. Committed to quality and continuous improvement, Daniel Defense creates the world’s finest weapon systems, precision rail systems, and accessories. They are intensely focused on providing top quality small arms solutions to our military and law enforcement communities, as well as to civilians seeking premium rifles for home defense, hunting, and sport shooting. Daniel Defense: Lighter. Stronger. Better...
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Barrel CoatingSalt Bath Nitride
Barrel ContourMk12
Barrel Length18
Barrel LiningChrome
Barrel Material416 Stainless Steel
BrandDaniel Defense
Caliber Gauge5.56 NATO
Gas System LengthRifle
Gas System TypeDirect Impingement
Handguard12 in Daniel Defense DDM4 Quad Rail
Muzzle DeviceDaniel Defense Flash Suppresor
Thread Pattern1/2 X 28
Twist Rate1:7
Weight7.41 lbs

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, see www.p65warnings.ca.gov

Ratings & Reviews

2 reviews

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I bought one of these with the $400 coupon, which made it a steal. I swapped the DD factory stock, grip, and trigger guard for some Magpul and B5 stuff that fit me better and also put Troy micro sights on it. This thing shoots like a dream. Smooth recoil, nice tight groups with my Leupold Mk4, and feels very balanced. Awesome product at an awesome price!

Nail Driver


I love DD products and have several DD rifles. I had to buy this one for the safe! The MK12 performed better than expected. I was putting some .5" to .7" groups at 300 and 400 yards. Used various grain ammo and a Leupold scope. This thing drives nails!!! Can't wait to see what it will do at 500 to 600 with SMK.