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The MK18 has been the gold standard for compact ARs ever since Daniel Defense started building uppers for special operations units, and the DD4 MK18 RIII is the most refined version of that platform yet. The heart of it is still the 10.3 inch cold hammer forged Government profile barrel, chrome lined and made from chrome moly vanadium steel with a 1:7 twist, the same length that made the original MK18 a favorite for close quarters work. A pinned low profile gas block feeds a carbine length direct impingement system, and the Daniel Defense flash suppressor up front is machined from 17-4 stainless with a salt bath nitride finish.
The two big changes are the rail and the lower. The RIS III handguard keeps the bombproof six bolt Bolt-Up mounting system and two piece free float design of the RIS II that SOCOM has run since 2006, but swaps the quad rail for M-LOK slots. That trims weight while keeping a full length uninterrupted 1913 top rail for optics, lasers, and backup sights, plus QD swivel points built right in. The DD4 lower is fully ambidextrous, so the bolt catch, safety, and mag release all work from either side without breaking your firing grip, and the GRIP-N-RIP charging handle is ambi as well. Both receivers are CNC machined from 7075-T6 aluminum with a Type III hard coat anodized finish.
At around 5.7 pounds, this thing is a joy to move with. The Daniel Defense buttstock and pistol grip have that soft touch overmolding that feels great against the shoulder and in the hand, and the included Santoprene rail ladders keep your support hand comfortable when the handguard heats up. It ships without sights, which most buyers prefer anyway since it leaves a clean slate for whatever red dot or LPVO setup you have in mind. The bolt carrier group is MP tested and chrome lined with a properly staked gas key, which is exactly the kind of detail Daniel Defense has built its reputation on. If you have been waiting for the right MK18, this is the one to get.
Two main upgrades. The DD4 lower receiver is fully ambidextrous, so the safety, bolt catch, and magazine release can all be run from either side, and the RIS III handguard replaces the classic quad rail with M-LOK attachment. You keep the same six bolt Bolt-Up mounting system and free float design from the RIS II, just with less weight and more flexibility for accessories.
No, it ships without iron sights. The full length 1913 top rail gives you plenty of real estate to mount a red dot, LPVO, or a set of backup irons however you like. Most buyers at this level already have a preferred optic setup, so the clean top rail is a plus.
Yes, the barrel comes threaded 1/2×28 with a Daniel Defense flash suppressor installed, so you can swap on a muzzle device or suppressor mount of your choice. Keep in mind a 10.3 inch 5.56 barrel runs a fairly aggressive gas system, so a quality suppressor built for short barrels is the way to go.
It runs a carbine length direct impingement gas system with a pinned low profile gas block machined from 4140 hardened steel. That is the same proven setup the MK18 platform has used for years, and it tucks neatly under the RIS III handguard. Pinning the gas block means it will not shift under hard use.
| UPC | 818773023252 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 02-088-10401-047 |
| Action | |
| ATF Type | RIFLE |
| Barrel Length | 10.3'' |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 30 |
| Color | Black |
| Length | 29.88'' |
| Magazine Included | 1 x 30-Round |
| Model | |
| Number of Magazines | 1 32 rd. |
| Package Height | 13.0 |
| Package Width | 4.0 |
| Product Type | SBR |
| Safety | Manual Safety |
| Shipping Weight | 11.95 |
| Sights | No Sights |
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