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Daniel Defense® DDM4® 300 S Complete Premium Upper Receiver Assembly – Fits Standard AR-15 Lowers – .300 AAC Blackout – 10.3" Cold Hammer Forged S2W® Barrel – DDM4 Rail 9.0 Quad-Rail System – Matte Black Anodized – 23-088-19020-047
Product Description
The Daniel Defense® DDM4® 300 S Complete Premium Upper Receiver Assembly (23-088-19020-047) represents a world-class standard in short-barrel weapon physics and hard-use tactical modularity, masterfully engineered in Black Creek, Georgia to unleash the maximum close-quarters terminal ballistic performance of the versatile .300 AAC Blackout cartridge. Designed for elite tactical operators, dynamic personal defense networks, and specialized military tracking groups who demand heavy .30-caliber energy out of an agile, ultra-maneuverable package, this complete upper group bridges the gap between subcompact pistol agility and rifle-grade stopping power. While standard short-barreled setups chambered in legacy calibers suffer from catastrophic velocity degradation, excessive unburnt powder flashes, and violent gas timing cycles that cause premature structural part wear, Daniel Defense completely engineers away those liabilities. This high-efficiency combat engine (815604015134) serves as an absolute plug-and-play solution, providing an indispensable primary asset for suppressed operations, vehicular deployment, and zero-fail home defense preparation.
The foundational core of this premium upper group is built around a match-grade 10.3-inch cold hammer forged (CHF) barrel forged from premium Chrome Moly Vanadium steel. Optimized with an ultra-durable, military-spec internal chrome lining and a heavy exterior phosphate coating, the barrel features Daniel Defense's proprietary S2W® (Strength-to-Weight) profile. This specialized contour maximizes structural rigidity to resist accuracy degradation under high thermal stress, while drastically damping barrel whip during rapid strings of fire. Utilizing a precise 1:8" right-hand twist rate, the bore perfectly stabilizes a massive spectrum of ammunition types—ranging from high-velocity supersonic defensive cartridges to ultra-heavy, bone-crushing subsonic hunting loads up to 220 grains. The barrel is fitted with a pinned low-profile gas block precision CNC-machined from 4140 hardened steel, powering a optimized direct-impingement pistol-length gas loop that produces soft, fluid, and completely predictable cycling kinetics with or without a sound suppressor attached downrange.
The true operational triumph of this American-built masterpiece lies in its classic quad-rail architecture and premium standalone accessory completion. Protecting the gas pipeline is the legendary Daniel Defense DDM4 Rail 9.0, a rugged 4-sided Picatinny handguard CNC-machined from 6061-T6 aluminum and treated with a Type III hardcoat anodization finish. This unyielding multi-slot rail framework provides continuous, solid structural alignment for tactical weapon lights, infrared targeting lasers, and combat optics, while shipping with three heat-resistant Santoprene® rail panels rated up to 300°F to guarantee an ultra-comfortable, non-slip manual purchase. Complete and ready to pin directly onto your host lower, the assembly features a Mil-Spec 7075-T6 receiver with index marks and M4 feed ramps, a heavy-duty 17-4 PH stainless steel flash suppressor on 5/8"-24 threads, an HP/MPI-tested M16 profile bolt carrier group, and the highly regarded GRIP-N-RIP™ ambidextrous charging handle. This 3.65-pound mechanical powerhouse provides total handling authority, ensuring your tactical configuration runs with zero-fail uniformity on the active firing line.
Includes: (1) Daniel Defense DDM4 300 S 10.3" Complete Upper Receiver Assembly (Type III Hardcoat Black Anodized Receiver & Rail, Pinned Low-Profile Gas Block, Pistol-Length Gas Tube), (1) Pre-Installed Mil-Spec Chrome-Lined M16 Profile Bolt Carrier Group, (1) GRIP-N-RIP Ambidextrous Charging Handle, (1) Pre-Timed 17-4 PH Stainless Steel Flash Suppressor, (3) High-Comfort Santoprene Picatinny Rail Panels, and Factory Branded Sealed Protective Retail Storage Presentation Packaging.
*Safety/Installation & Regulatory NFA Guidance: The Daniel Defense 23-088-19020-047 complete upper assembly instantly pins onto any standard, mil-spec AR-15 pattern lower receiver frame. Because this premium unit incorporates a compact 10.3-inch short barrel footprint, marrying it to a lower receiver natively outfitted with a standard rifle buttstock legally reclassifies the complete firearm as a Short Barreled Rifle (SBR) under federal jurisdiction, necessitating active National Firearms Act (NFA) registration and an approved ATF Form 1 prior to physical attachment. To maintain immediate lawful civilian compliance without NFA documentation, ensure this upper is hosted exclusively on an AR-15 lower receiver legally registered and maintained as a handgun/pistol configuration. Always visually and physically verify that your host receiver is completely clear of live ammunition prior to pin alignment drills.
Key Features
- Cold Hammer Forged S2W® Barrel: Proprietary Strength-to-Weight profile barrel delivers target-match accuracy and maximum rigidity under punishing thermal strings.
- Pistol-Length Direct Impingement Gas: Finely tuned gas port geometry guarantees fluid, soft-recoiling manual action cycles across both subsonic and supersonic cartridge weights.
- DDM4 Rail 9.0 Quad-Rail System: High-strength 4-sided Picatinny system provides complete, rigid real estate for mechanical switches and lasers with zero zero-shift tracking flex.
- GRIP-N-RIP™ Ambidextrous Charging: Advanced gas-busting charging handle features fully independent ambidextrous levers to vent gas away from the operator's vision.
- Chrome-Lined M16 Bolt Carrier Group: Full-auto rated Mil-Spec carrier group is magnetic particle inspected and chrome-lined to resist high-volume carbon caking and heat friction.
- Santoprene® Rail Grip Panels: Includes three detachable, low-profile textured handguards heat-resistant to 300°F to isolate your support hand from barrel heat transfer.
Product Specifications
- Brand: Daniel Defense® (Black Creek, Georgia, USA)
- Product Line: Factory Premium Complete Upper Receiver Group (URG) Series
- Model Series Designation: Daniel Defense DDM4 300 S Upper Receiver Group - Black
- SKU / MPN: 23-088-19020-047 (Alternative Part Identifiers: 23-088-19020-047-DD / DD-19020)
- Firearm Lower Compatibility: Fits Standard AR-15 Lower Receivers (Legally Host Pistol or NFA Registered SBR Frameworks)
- Caliber Class Chambering: .300 AAC Blackout (7.62x35mm / 300 BLK)
- Operating System Layout: Direct Impingement (DI) Pistol-Length Low-Profile Gas Block Loop
- Barrel Length Specification: 10.3 Inches (261.62 mm) Carbine/Pistol Tactical Length
- Barrel Contour / Profile: Proprietary S2W® (Strength-to-Weight) Heavy Rigid Contour
- Barrel Manufacturing Material: Cold Hammer Forged Chrome Moly Vanadium Steel (HP/MPI Tested)
- Bore Protection / Lining: Advanced Internal Military-Spec Corrosion-Resistant Chrome Lining
- Rifling Twist Rate Parameter: 1:8" Precision Right-Hand Twist (Suppressed Subsonic Optimized)
- Muzzle Thread Pattern: 5/8"-24 TPI (Threads Per Inch) Standard Heavy-Caliber Muzzle Profile
- Pre-Installed Muzzle Device: Daniel Defense 17-4 PH Stainless Steel Extended Flash Suppressor (Salt Bath Nitride Finish)
- Handguard Rail Attachment Class: Daniel Defense DDM4 Rail 9.0 Monolithic Quad-Rail Picatinny System
- Upper Receiver Shell Construction: CNC Precision-Machined Mil-Spec 7075-T6 Aluminum with Indexing Marks
- Surface Protection Finish: Low-Glare Abrasion-Resistant Type III Hardcoat Anodized Black Matte Armor
- Bolt Carrier Group Matrix: M16 Profile Full-Auto Rated Chrome-Lined Properly Staked Gas Key BCG
- Product Net Component Weight: ~3.65 lbs (~58.40 oz) - Solid High-Mass Balanced Upper Frame
- Total Packaging Shipping Mass: ~4.95 lbs (Enclosed Inside Original Branded Factory Protective Distribution Packaging Box)
- UPC Barcode: 815604015134
