The Daniel Defense M4A1 RIII URG is a complete upper receiver group built for shooters who demand a compact, legally compliant carbine without NFA paperwork. The 14.5″ barrel pairs with a permanently pinned-and-welded flash suppressor, bringing total length to 16 inches. This configuration delivers full-power 5.56 NATO performance in a handy package.
Every Daniel Defense upper ships hand-assembled, quality-tested, and test-fired from the factory. The RIS III 12.5 free-float M-LOK handguard uses Daniel Defense’s proprietary 6-bolt attachment system for rock-solid accuracy. FDE finish provides durable corrosion resistance and a modern look.
This upper works with any mil-spec AR-15 lower receiver and standard components. Whether you’re building a home-defense carbine or duty rifle, the M4A1 RIII URG delivers precision and reliability. Additionally, the RIS III rail accepts any M-LOK accessory on the market.
Materials & Construction
Upper Receiver: Mil-Spec with Indexing Marks and M4 Feed Ramps, CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
Barrel: 14.5″ Government Profile, Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, Chrome Lined, Mil-Spec Heavy Phosphate Coated, HP/MPI Tested — with a Daniel Defense Flash Suppressor permanently pinned and welded to bring total barrel length to 16″, a non-NFA configuration that requires no tax stamp
Gas System: Pinned Low-Profile Gas Block, CNC Machined of 4140 Hardened Steel, Mil-Spec Heavy Phosphate Coating, Mid-Length, Direct Impingement
Muzzle Device: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished — pinned and welded to the barrel for 16″ overall length
Handguard: Daniel Defense RIS III 12.5, Patented 6-Bolt Bolt-Up System, CNC Machined of 6061-T6 Aluminum, M-LOK Attachment
Bolt Carrier Group: M16 Profile Bolt Carrier Group, Mil-Spec MP Tested, Chrome Lined, with Properly Staked Gas Key
Charging Handle: Daniel Defense 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
Rail Panels: Daniel Defense Rail Panels, Santoprene, Heat Resistant to 300°F
Specifications
SKU / MPN
DD-23-004-01097-011
Product Type
Complete Upper Receiver Group
Item Condition
New
Caliber
5.56 NATO
Finish
FDE
Receiver Material
7075-T6 Aluminum, Type III Hard Coat Anodized
Barrel
14.5″ Government Profile, Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, Chrome Lined, Mil-Spec Heavy Phosphate Coated, HP/MPI Tested — with a Daniel Defense Flash Suppressor permanently pinned and welded to bring total barrel length to 16″, a non-NFA configuration that requires no tax stamp
Gas System
Pinned Low-Profile Gas Block, CNC Machined of 4140 Hardened Steel, Mil-Spec Heavy Phosphate Coating, Mid-Length, Direct Impingement
Handguard / Rail System
Daniel Defense RIS III 12.5, Patented 6-Bolt Bolt-Up System, CNC Machined of 6061-T6 Aluminum, M-LOK Attachment
Bolt Carrier Group
M16 Profile Bolt Carrier Group, Mil-Spec MP Tested, Chrome Lined, with Properly Staked Gas Key
Charging Handle
Daniel Defense 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
Muzzle Device
Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished — pinned and welded to the barrel for 16″ overall length
Although the bare barrel measures 14.5 inches, Daniel Defense permanently pins and welds the flash suppressor to the muzzle, bringing the total barrel length to 16 inches. This is a non-NFA configuration — no ATF Form 1 or tax stamp is required for this upper as configured.
Why Buy from Western Sport?
Western Sport’s staff has decades of Daniel Defense platform experience and real-world expertise.
We provide personal guidance on upper-to-lower matching and complete build questions.
Competitive pricing on factory-direct Daniel Defense components reflects our volume relationships.
After-sale support includes warranty troubleshooting and Daniel Defense technical reference.
Frequently Asked Questions
Q: What ammunition performs best with the 5.56 NATO caliber in this upper?
A: The M4A1 RIII URG handles any NATO 5.56 round reliably. Commercial loads, Lake City, and match-grade ammunition all function flawlessly. For precision work, 69-77 grain match ammo maximizes the 14.5″ barrel’s velocity potential.
Q: Which lower receivers is this complete upper compatible with?
A: This upper mates with any mil-spec AR-15 lower receiver without modification. It accepts standard bolt carrier groups, charging handles, and all common AR parts. Compatibility is guaranteed across all major manufacturers and platform variants.
Q: How does the RIS III handguard compare to other Daniel Defense rail systems?
A: The RIS III offers superior ergonomics and M-LOK modularity over earlier platforms. Its 12.5″ length balances accessibility with full handguard coverage. The 6-bolt attachment system delivers tighter tolerances than standard barrel nut designs.
Q: What exactly comes included with this complete upper receiver group?
A: This URG includes the upper receiver, barrel, bolt carrier group, charging handle, and RIS III handguard. You supply only the lower receiver and firing pin. Installation takes 15 minutes with basic tools.
Q: What is the RIS III rail system on this upper?
A: The RIS III is Daniel Defense’s next-generation free-float handguard. It uses a patented 6-bolt Bolt-Up System for a more secure, repeatable zero than older quad-rail designs. Furthermore, M-LOK slots run along the rail for mounting lights, lasers, and grips.
Q: Do I need NFA paperwork for this upper?
A: No. Although the bare barrel measures under 16 inches, Daniel Defense permanently pins and welds the flash suppressor to reach a full 16 inches. As a result, this upper is a non-NFA configuration and requires no tax stamp.
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