The Daniel Defense MK12 5.56 NATO rifle in its California Compliant version (brand part no. 0214213175055) is a special purpose rifle built on an 18-inch stainless barrel. Daniel Defense forges the chamber during the cold hammer forging process, finishes the barrel in DLC and pairs it with a rifle-length direct impingement gas system. A 12-inch free-floating Picatinny quad rail and the Geissele SSA 2-stage trigger round out a rifle aimed at precise fire at distance. It ships with a Magpul PMAG 10-round magazine, which makes it a good fit for range work and precision-minded AR builds.

Key Specifications

• The chambering is 5.56mm NATO, the standard cartridge for AR-15 pattern rifles.
• The barrel is an 18-inch cold hammer forged stainless barrel with the MK12 profile and a DLC finish for accuracy and durability.
• The rate of twist is 1:7, which handles the heavier bullets common in precision loads.
• The trigger is the Geissele SSA 2-stage, chosen for a clean break on precise shots.
• The handguard is a 12-inch free-floating Picatinny quad rail, which carries optics and accessories without touching the barrel.
• The gas system is a rifle-length direct impingement design using the MK12 low-profile gas block built to Crane specifications.
• The muzzle device is a Daniel Defense flash suppressor threaded 1/2×28.
• The rifle ships with a Magpul PMAG 10-round magazine in this California Compliant version.
• Sights are sold separately, so you can mount the optic or irons that match your use.
• It weighs 7.41 pounds, with an overall length of 34 3/4 to 37 7/8 inches with the muzzle device.

Frequently Asked Questions

What magazine does this MK12 come with? It ships with a Magpul PMAG 10-round magazine in this California Compliant version.

Does it come with sights? No. Daniel Defense lists sights as sold separately, and the 12-inch Picatinny rail gives you plenty of room to mount them.

What trigger does it use? It uses the Geissele SSA 2-stage trigger.

Buy the Daniel Defense MK12 Rifle, 5.56 NATO, 18-Inch Stainless Barrel, California Compliant, 10-Round

The MK12 is a purpose-built precision AR, and this version keeps the stainless barrel, the Geissele trigger and the long free-floating rail intact. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and look through more AR rifles.