Maxim Defense Industries PDX Complete Upper – 300 Blackout, 5.5" Barrel, Flat Dark Earth Finish (MXM-47826)
Discover the ultimate blend of performance, durability, and precision with the Maxim Defense Industries PDX Complete Upper. Engineered for the modern shooter, this complete upper receiver is chambered in the versatile 300 Blackout caliber and features a compact 5.5" barrel finished in a rugged Flat Dark Earth (FDE) coating. Whether you’re building a tactical platform, a home defense system, or a lightweight competition rifle, the PDX upper delivers unmatched reliability and accuracy.
Key Features & Benefits
- 300 Blackout Caliber: Optimized for subsonic and supersonic loads, offering superior flexibility for close‑quarter and mid‑range engagements.
- 5.5" Cold Hammer‑Forged Barrel: Provides a perfect balance of maneuverability and ballistic performance while maintaining consistent shot‑to‑shot precision.
- Flat Dark Earth (FDE) Finish: A non‑reflective, corrosion‑resistant coating that blends seamlessly with tactical gear and reduces visual detection.
- Full-Length Upper Assembly: Includes a fully machined upper receiver, hand‑guard, bolt carrier group, charging handle, and gas system—ready to install on any compatible lower.
- Enhanced Gas System: Optimized for 300 Blackout, delivering reliable cycling across a wide range of ammunition types.
- Compatibility: Fits standard AR‑15 platforms, allowing easy integration with your existing lower receiver, stock, and accessories.
- Durability: Constructed from high‑grade 7075‑T6 aluminum and heat‑treated steel components for long‑term endurance under harsh conditions.
- Precision Engineering: Tighter tolerances and a match‑grade barrel ensure exceptional accuracy out of the box.
Technical Specifications
| Manufacturer | Maxim Defense Industries |
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| Model | PDX Complete Upper |
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| Part Number | MXM-47826 |
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| UPC | 680017478261 |
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| Caliber | 300 Blackout |
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| Barrel Length | 5.5 inches |
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| Barrel Type | Cold Hammer‑Forged, 1:7 twist |
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| Finish | Flat Dark Earth (FDE) |
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| Receiver Material | 7075‑T6 Aluminum |
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| Gas System | Mid‑length, tuned for 300 Blackout |
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| Included Components | Upper receiver, hand‑guard, bolt carrier group, charging handle, gas block, gas tube, muzzle device (compatible with suppressor), and mounting hardware |
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| Weight (complete upper) | ≈ 2.2 lbs (1.0 kg) |
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Why Choose the Maxim Defense PDX Upper?
The Maxim Defense Industries PDX upper is more than just a component; it’s a complete solution for shooters who demand elite performance without compromising on reliability. Its 300 Blackout chambering gives you the ability to switch seamlessly between high‑velocity and subsonic rounds, making it ideal for tactical operations, hunting, and competitive shooting.
Thanks to the 5.5" barrel’s compact profile and the flat dark earth finish, this upper blends perfectly into low‑light and urban environments while delivering the accuracy expected from a premium barrel. The robust gas system ensures clean cycling, even when using heavy subsonic loads with a suppressor attached.
Installation & Compatibility
Designed to work with any standard AR‑15 lower receiver, the PDX upper can be installed in minutes using basic tools. The hand‑guard’s modular design supports a wide range of accessories, including rail systems, lights, and grips, allowing you to customize the platform to your exact operational needs.
Ideal Applications
- Home defense and personal security
- Law enforcement tactical units
- Special operations and SWAT teams
- Competitive shooting (3‑gun, pistol‑caliber matches)
- Hunting small to medium game with subsonic loads
- Recreational shooting and range training
Customer Support & Warranty
Maxim Defense Industries stands behind every product with a comprehensive warranty and dedicated customer support. Should you have any questions regarding installation, performance, or part compatibility, our experienced technical team is ready to assist you promptly.
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Upgrade your rifle platform today with the Maxim Defense Industries PDX Complete Upper and experience the perfect combination of precision engineering, rugged durability, and tactical versatility.
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