Daniel Defense DDM4 MK12 5.56 NATO Semi-Automatic Rifle, 18" Stainless Barrel, Geissele SSA Trigger
This DDM4 MK12 pairs Daniel Defense’s proven AR-15 platform with an 18-inch cold-hammer-forged stainless barrel, a Geissele SSA two-stage trigger, and a host of duty-grade upgrades. Built in the USA and rooted in the SOCOM Mk12 SPR program, it offers precision-focused features in a lightweight, full-size package.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The rifle is in fantastic shape throughout, with no notable cosmetic blemishes.
What’s Included
- Daniel Defense branded hard rifle case
- 2× 30-round USGI-style aluminum magazines
- Daniel Defense DD4/DDM4/DD5 owner’s manual
- Geissele Automatics SSA trigger manual
- Daniel Defense enhanced butt-pad (installed)
The heart of this MK12 is its 18-inch, cold-hammer-forged stainless barrel with a heavy SPR profile. A DLC (Diamond-Like Carbon) finish and Daniel Defense Improved Flash Suppressor complete the threaded muzzle (1/2x28 TPI), ready for a brake or suppressor.
Inside, a Geissele SSA two-stage trigger breaks at a consistent 4.5 lb, giving the shooter a clean first stage and a crisp second stage for precise shots. Magnetic-particle and high-pressure testing on critical steel parts ensure durability under sustained fire.
The rifle-length direct-impingement gas system, combined with the 12-inch DDM4 Rail, offers smooth recoil impulse and ample rail space. Laser-numbered Picatinny slots, an ambidextrous Grip-N-Rip charging handle, and an ambidextrous QD end-plate expand mounting and handling options.
A 7075-T6 aluminum receiver set is finished with Type III hard-coat anodizing and features an enhanced flared mag-well for faster reloads. The six-position stock with Soft-Touch overmold, herring-bone textured pistol grip, and enhanced butt-pad add comfort and control without unnecessary weight.