Daniel Defense DDM4 MK12 5.56 NATO AR-15, 18 in CHF Stainless Barrel, Free-Float Quad Rail, Custom 3-Port Brake
This Daniel Defense DDM4 MK12 stands out with its 18-inch cold hammer forged stainless steel barrel in the MK12 profile, rifle-length gas system, and Daniel Defense DDM4 Rail 12.0 free-float quad rail. The upper is marked "MK12" and "5.56," and the receiver carries correct Daniel Defense Black Creek, GA markings. It is thoughtfully upgraded with a non-factory 3-port muzzle brake, UTG vertical foregrip, Nightstick weapon light, and Daniel Defense rubber rail panels.
The rifle uses a direct impingement, semi-automatic action with a low-profile steel gas block secured by two fasteners. The continuous T-marked top Picatinny rail and integral QD sling sockets on the handguard support flexible mounting. The 1:7 twist, 1/2x28 threaded muzzle, and B-marked bolt are notable features for buyers who value quality components and compatibility.
Ergonomics are handled by a 6-position collapsible polymer stock with QD sling sockets and a Daniel Defense pistol grip. There are no sights included. The platform accepts STANAG-pattern 5.56 magazines, and the standard magazine release and manual safety are retained.
Overall length runs approximately 34.75–37.875 inches with an unloaded weight of about 7.41 lb. This example includes one 32-round magazine and one 30-round magazine, providing a listed capacity of 32+1.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are scattered light scratches and small blemishes from prior handling and use.
What’s Included
- Plano hard rifle case
- UTG vertical foregrip (installed)
- Nightstick weapon light (installed)
- Daniel Defense rubber rail panels (installed)
- Manual
- 1x 32-round magazine
- 1x 30-round magazine
- Magazine details: One magazine is a Magpul PMAG with window; the other is a polymer magazine (brand not identified).
The DDM4 MK12 configuration centers on precision-oriented components. The 18-inch MK12-profile, cold hammer forged stainless barrel pairs with a rifle-length gas system for smooth cycling. The muzzle is threaded 1/2x28, and this rifle wears a non-factory 3-port muzzle brake with a locking collar.
The Daniel Defense DDM4 Rail 12.0 free-float quad rail features a continuous T-marked top Picatinny rail and integral QD sling sockets, with a low-profile steel gas block attached by two fasteners and positioned forward of the handguard. Markings include "Daniel Defense, Black Creek, GA U.S.A., MODEL DDM4, CAL: MULTI" on the receiver and "MK12" and "5.56" on the upper. The bolt shows a "B" marking.
Furniture and controls include a 6-position collapsible polymer stock with QD sling sockets, a Daniel Defense pistol grip, a standard magazine release, and a manual safety. No sights are included. The rifle accepts STANAG-pattern 5.56 magazines.
Factory configuration typically shipped with a flash suppressor; this example is equipped with a non-factory 3-port muzzle brake. Installed accessories include a UTG vertical foregrip, a Nightstick weapon light, and Daniel Defense rubber rail panels. Approximate overall length is 34.75–37.875 inches, and unloaded weight is about 7.41 lb.