The Daniel Defense DD4 RIII URG is a complete 5.56mm upper receiver group built for shooters who need a compact, combat-proven platform. At 11.5 inches, this barrel length delivers the ballistics you need for tactical and home-defense roles while keeping your overall profile manageable—ideal for SBR builds, close-quarters work, or anyone running a shorter AR. DD brings decades of mil-spec manufacturing to this upper, and it shows in every detail.
The heart of this upper is a cold hammer-forged government profile barrel in 4140 chrome moly vanadium steel with a 1:7 twist rate, chrome-lined and mil-spec phosphate coated for durability. Paired with a pinned low-profile gas block and carbine-length gas system, it delivers reliable operation across a wide range of ammunition. The DD4 RIII handguard is a 10.5-inch M-LOK-compatible rail that borrows from Daniel Defense's legendary RIS II design—lightweight, modular, and built to take a beating. The included GRIP-N-RIP charging handle and M16 profile bolt carrier group (properly staked and chrome-lined) round out a no-nonsense package that's ready to work out of the box.
The upper itself is CNC-machined 7075-T6 aluminum with mil-spec indexing marks and M4 feed ramps, and it wears a Daniel Defense flash suppressor finished in salt bath nitride for corrosion resistance. This is the kind of upper you'll see on professional rigs because it simply works—no marketing hype, just solid engineering and proven performance.
| Caliber | 5.56mm NATO |
| Barrel Length | 11.5" |
| Barrel Material | 4140 Chrome Moly Vanadium Steel, Chrome Lined |
| Barrel Profile | Government Profile |
| Twist Rate | 1:7 |
| Gas System | Carbine Length |
| Gas Block | Pinned Low Profile, 4140 Hardened Steel, Mil-Spec Phosphate Coated |
| Handguard | 10.5" RIS III M-LOK Compatible |
| Upper Receiver | 7075-T6 Aluminum, Mil-Spec, with Indexing Marks and M4 Feed Ramps |
| Bolt Carrier Group | M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key |
| Muzzle Device | Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished |
| Charging Handle | GRIP-N-RIP |
| Finish | FDE (Flat Dark Earth) |
This is a mil-spec upper receiver, so it's compatible with any standard AR-15 lower receiver. It follows mil-spec indexing standards.
Yes. At 11.5 inches, this barrel is purpose-built for short-barreled rifle applications where you need a compact, maneuverable platform without sacrificing reliability or performance.
The complete upper includes the upper receiver, 11.5" barrel, RIS III handguard, carbine-length gas system with pinned gas block, bolt carrier group, flash suppressor, and GRIP-N-RIP charging handle. It's a drop-in ready package.
The Daniel Defense flash suppressor is pre-installed. If you want to change it, you'll need to remove it first—the barrel is threaded for standard 1/2x28 TPI muzzle devices.
Daniel Defense
Daniel Defense
Daniel Defense
Daniel Defense
