The Faxon Duty .300 BLK 10.5" Suppressor Ready Upper (Model FXURGD3B105GA9CSR) is a premium, professional-grade upper receiver assembly designed for serious .300 Blackout AR-15 builds. Featuring a 10.5-inch threaded barrel and a durable black finish, this upper is engineered for reliability, accuracy, and seamless suppressor integration. Whether you’re building a high-performance suppressed SBR, a dedicated home defense rifle, or a versatile hunting platform, the Faxon Duty .300 BLK Upper delivers the quality and performance that Faxon Firearms is known for.
10.5-Inch Suppressor Ready Barrel
The 10.5-inch barrel is the centerpiece of this upper receiver. Precision-machined and threaded in the standard 5/8x24 pattern, it is fully suppressor-ready right out of the box. The 10.5-inch length offers an excellent balance between compactness and ballistic performance for the .300 Blackout cartridge. This barrel length allows the .300 BLK to achieve strong velocities with both supersonic and subsonic ammunition while keeping the overall firearm highly maneuverable. The suppressor-ready design allows users to easily add a suppressor for reduced noise signature and recoil without requiring additional modifications.
The Faxon Duty .300 BLK 10.5" Suppressor Ready Upper combines a versatile barrel length with full suppressor compatibility, making it ideal for both suppressed and unsuppressed .300 Blackout builds.
Optimized for .300 Blackout
The .300 Blackout cartridge was specifically designed to perform well in short barrels, and the Faxon Duty upper takes full advantage of this. The 10.5-inch barrel allows the .300 BLK to deliver excellent terminal performance with both supersonic loads for longer-range use and subsonic ammunition when paired with a suppressor. This makes the upper extremely versatile for home defense, hunting, and tactical applications.
Duty Series Build Quality
The Faxon Duty series represents a step above standard AR components. This upper is built with higher-grade materials and tighter manufacturing tolerances to ensure long-term durability and consistent performance. It includes a robust bolt carrier group and a high-quality barrel that maintains accuracy during extended shooting sessions. The black finish provides excellent corrosion resistance and a professional, tactical appearance suitable for both duty and recreational use.
AR-15 Platform Compatibility
This upper receiver is designed to work seamlessly with standard AR-15 lower receivers. It utilizes a direct impingement gas system optimized for .300 Blackout and is compatible with standard AR-15 magazines. Builders can create a highly customized .300 BLK rifle while retaining the familiar ergonomics, controls, and massive aftermarket support of the AR-15 platform.
Key Features of the Faxon Duty .300 BLK Upper
- 10.5-Inch Threaded Barrel – Suppressor ready with 5/8x24 threading
- Caliber – .300 Blackout (.300 BLK)
- Gas System – Direct Impingement
- Finish – Durable Black
- Series – Duty Series (Premium Components)
- Model – FXURGD3B105GA9CSR
- UPC – 810209950569
Why Choose the Faxon Duty .300 BLK 10.5" Suppressor Ready Upper?
The Faxon Duty .300 BLK 10.5" Suppressor Ready Upper is an excellent choice for builders who want a high-quality, suppressor-optimized .300 Blackout upper with better velocity than shorter barrels. The 10.5-inch length provides improved ballistic performance over 8.5-inch or 9-inch options while still maintaining a compact overall length when suppressed. Faxon’s reputation for producing high-quality barrels and reliable components makes this upper a strong foundation for any serious .300 BLK AR-15 build.
Technical Specifications
| Brand | Faxon Firearms |
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| Model | Duty .300 BLK Suppressor Ready Upper |
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| Part Number | FXURGD3B105GA9CSR |
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| Caliber | .300 Blackout |
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| Barrel Length | 10.5 Inches (Threaded) |
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| Thread Pattern | 5/8x24 |
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| Finish | Black |
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| Gas System | Direct Impingement |
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| Platform | AR-15 |
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| UPC | 810209950569 |
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Ideal Applications
The Faxon Duty .300 BLK 10.5" Suppressor Ready Upper is ideal for building suppressed home defense rifles, hunting rifles, truck guns, and tactical platforms. The 10.5-inch barrel offers improved velocity and energy compared to shorter options while still allowing for a compact overall length when paired with a suppressor. It is also well-suited for recreational shooters and builders looking for a high-quality, suppressor-optimized .300 Blackout upper receiver assembly.
Build a high-performance .300 Blackout platform with the Faxon Duty Suppressor Ready Upper. Featuring a 10.5-inch threaded barrel, black finish, and premium Duty Series construction, this Model FXURGD3B105GA9CSR delivers reliability, versatility, and suppressor compatibility for AR-15 .300 BLK builds. UPC 810209950569.
