Daniel Defense DDM4 MK18 SBR 5.56 NATO, 10.3 in CHF Chrome-Lined Barrel, MK18 RIS II FDE, Upgraded Trigger & Ambi Charging Handle
This Daniel Defense DDM4 MK18 short-barreled rifle pairs the proven 10.3 in cold hammer-forged, chrome-lined barrel with the MK18 RIS II quad rail in Flat Dark Earth. It features forged 7075-T6 receivers, the Daniel Defense Bolt-Up free-float interface, and a carbine-length gas system. Notable upgrades include an ambidextrous extended charging handle and an aftermarket skeletonized single-stage trigger. This is an NFA item and will require a tax stamp.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
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 great shape overall, with minor scratches and small blemishes on exterior surfaces. The brass deflector shows noticeable finish blemishing.
What’s Included
- Original hard case
- 1x 32-round Daniel Defense polymer magazine (AR-15/5.56)
- Daniel Defense rail-mounted QD sling-mount block (installed)
- Flip-up front and rear iron sights (installed)
- Polymer ladder/panel rail covers on handguard (installed)
- Ambidextrous extended charging handle (installed)
- Aftermarket skeletonized single-stage trigger (installed)
The MK18 upper is marked "DDMK18" and is mated to the MK18 RIS II quad rail in FDE, marked with Cage Code 3E3E2 and U.S. Patent No. 7,716,865. The top rail is T-marked for repeatable accessory placement, and polymer rail covers are installed for grip and protection. A Daniel Defense QD sling-mount block is already in place.
The 10.3 in barrel is 4150 CMV steel, cold hammer-forged, chrome-lined, and threaded 1/2x28 with an open-prong flash hider. A 1:7 RH twist supports a wide range of 5.56mm projectiles, and the carbine-length gas system keeps the package compact while maintaining reliable cycling.
Receivers are forged 7075-T6 aluminum with an earth-tone brown finish, and the Daniel Defense Bolt-Up free-float interface secures the handguard without bearing on the barrel. The rifle uses the AR-15 platform with a semi-automatic direct-impingement action.
User-focused upgrades include an ambidextrous extended charging handle and a skeletonized single-stage trigger. A collapsible stock and a Daniel Defense pistol grip with textured rubber panels round out the controls, while flip-up iron sights provide an immediate sighting solution out of the box.
This factory MK18 configuration reflects SOCOM Block II lineage, with the RIS II rail selected for SOPMOD Block II programs. Approximate overall length is 26.75–29.88 in, and weight is about 6.0 lb. This is an NFA item and will require a tax stamp.