Daniel Defense 02-088-00319-047 DD4 MK18 RIII 5.56mm 10.3" Short Barrel Rifle

The Daniel Defense DD4 MK18 RIII is a 5.56mm short-barreled rifle with a 10.3-inch Cold Hammer Forged barrel, designed for optimal performance in close-quarters battle (CQB). Daniel Defense 02-088-00319-047 features the advanced Daniel Defense RIS III Rail Interface System, which reduces weight and enhances versatility with seven M-LOK attachment points and integrated QD swivel attachment points. The rifle maintains an uninterrupted upper rail platform with Mil-Spec 1913 rails and includes an ambidextrous GRIP-N-RIP Charging Handle. It also comes with a Daniel Defense Buttstock, Pistol Grip, and heat-resistant Santoprene rail ladders for comfort and durability.

The DD4 MK18 RIII AR15-style short-barreled rifle sets the standard for size, weight, and performance. Building upon the legacy of our highly successful MK18, it incorporates the revolutionary Daniel Defense RIS III Rail Interface System. This innovative system refines our proven two-piece RIS II rail design—trusted by U.S. Special Operations Command (SOCOM) since 2006—by reducing weight and increasing versatility through M-LOK attachment points. You’ll benefit from the same reliable free-float barrel design, durable aircraft-grade aluminum construction, and an uninterrupted upper rail platform with a Mil-Spec 1913 rail. Additionally, the Daniel Defense DD4 MK18 RIII Rifle features seven M-LOK attachment points along the handguard and integrated QD swivel attachment points on both sides, enhancing flexibility and functionality.

The heart of the rifle remains the MK18, with a 10.3-inch Cold Hammer Forged barrel—the standard for CQB operations. An independently ambidextrous GRIP-N-RIP Charging Handle ensures easy operation for both left- and right-handed shooters. The rifle also includes our ergonomically designed Daniel Defense Buttstock and Pistol Grip, along with three low-profile rail ladders made from heat-resistant Santoprene to protect your support hand during intense use.

With the DD4 MK18 RIII, you get unmatched durability, versatility, and performance in a compact, lightweight package.

Features of the Daniel Defense DD4 MK18 RIII:

• LOWER RECEIVER: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized


• UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized


• BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 10.3" Government Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested


• GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 Hardened Steel and Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement


• MUZZLE DEVICE: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished


• BOLT CARRIER GROUP: M16 Profile, MP Tested, Chrome Lined, Properly Staked Gas Key


• BUFFER: H Buffer


• SIGHTS: Sold Separately


• HANDGUARD: Daniel Defense 9.5” RIS III, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized


• CHARGING HANDLE: GRIP-N-RIP Charging Handle, Body CNC Machined of 7075-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized


• RECEIVER EXTENSION: 6 Position Mil-Spec 7075-T6 Aluminum


• BUTTSTOCK: Daniel Defense Buttstock, Glass Filled Polymer with Soft Touch Overmolding


• PISTOL GRIP: Daniel Defense Pistol Grip, Glass Filled Polymer with Soft Touch Overmolding


• RAIL LADDERS: Three (3) low-profile ladders made from Santoprene, heat resistant to 300° F.


• Made in the USA