Faxon Firearms  |  SKU: RSR-FX10A863C16NGQ

Faxon Firearms - Duty Series Gunner Profile 16" 8.6 BLK AR10 Barrel

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Description

The Faxon Duty Series Gunner Profile 16" 8.6 BLK AR10 Barrel is a meticulously engineered component designed for the AR-10 platform. This barrel is crafted from 4150 CMV steel and features a QPQ nitride finish for enhanced hardness and corrosion resistance. With a unique 1:3 twist rate, this barrel is optimized for stabilizing heavy subsonic rounds, making it ideal for suppressed shooting applications. The Gunner profile maintains a balance of strength and weight, ensuring durability without unnecessary bulk.

Designed to accommodate a wide range of ammunition, this barrel is chambered for the 8.6 Blackout cartridge, which was SAAMI-accepted in January 2026. The carbine-length gas system, with a .104" port, provides reliable cycling for both supersonic and subsonic loads. This barrel is perfect for those looking to build a versatile AR-10 rifle capable of handling various shooting scenarios.

Key Features

  • Caliber: 8.6 BLK
  • Barrel Length: 16.13" (16" nominal)
  • Material: 4150 CMV bar stock
  • Finish: Salt-bath QPQ nitride, bore and exterior
  • Twist Rate: 1:3 RH, 5-groove button rifling
  • Gas System: Carbine-length; .104" port
  • Weight: 2.2 lbs
  • Muzzle Thread: M18x1.5-6g, 20° tapered shoulder
  • Gas Block Diameter: .875"
  • Made in: Greater Cincinnati, Ohio, USA

Specifications

  • Profile: Gunner (AR-10; formerly Big Gunner)
  • Gas Journal: .875" (.8740–.8747"), 1.9" long
  • Extension: FF-300 DPMS Gen 1 pattern .308 extension, black oxide
  • Headspace: 100%, 8.6 BLK go/no-go gauge after assembly
  • Ammunition: 150–180 gr supersonic, 210–300+ gr subsonic
  • Warranty: Faxon Lifetime Guarantee

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Frequently Asked Questions

What makes the Gunner Profile of the Faxon Duty Series 16" 8.6 BLK AR10 Barrel unique?

The Gunner Profile of the Faxon Duty Series 16" 8.6 BLK AR10 Barrel is designed to balance strength and weight. This profile is crafted to maintain durability while minimizing unnecessary bulk, making it ideal for those who require a robust yet lightweight barrel. The profile allows for effective heat dissipation and improved handling, which is crucial during extended shooting sessions. This design ensures that the barrel performs reliably without adding excessive weight to your AR-10 platform.

How does the 1:3 twist rate benefit the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

The 1:3 twist rate of the Faxon Duty Series 16" 8.6 BLK AR10 Barrel is specifically designed to stabilize heavy subsonic rounds. This is particularly beneficial for suppressed shooting applications, where subsonic ammunition is often used to minimize noise. The faster twist rate ensures that the longer, heavier bullets remain stable in flight, resulting in improved accuracy and consistency. However, this twist rate may not be ideal for lighter, supersonic rounds, so it's important to match your ammunition choice with the barrel's capabilities.

What materials are used in the construction of the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

The Faxon Duty Series 16" 8.6 BLK AR10 Barrel is constructed from 4150 CMV steel. This material is known for its excellent strength and wear resistance, making it a popular choice for firearm barrels. The barrel is further enhanced with a QPQ nitride finish, which increases its hardness and provides superior corrosion resistance. This combination of materials and finish ensures the barrel can withstand harsh environmental conditions and maintain its performance over time.

How does the carbine-length gas system affect the performance of the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

The carbine-length gas system in the Faxon Duty Series 16" 8.6 BLK AR10 Barrel is designed for reliable cycling with both supersonic and subsonic loads. This system features a .104" gas port, which ensures consistent gas flow to operate the AR-10's action smoothly. The carbine-length setup strikes a balance between recoil management and operational reliability, making it suitable for a wide range of shooting applications. However, users should ensure their ammunition and suppressor setups are compatible with this gas system to achieve optimal performance.

What are the advantages of the QPQ nitride finish on the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

The QPQ nitride finish on the Faxon Duty Series 16" 8.6 BLK AR10 Barrel offers several advantages. This finish significantly enhances the barrel's surface hardness, providing increased resistance to wear and abrasion. Additionally, the nitride treatment improves corrosion resistance, which is crucial for maintaining the barrel's integrity in various environmental conditions. These properties ensure that the barrel remains durable and performs reliably over its lifespan, even with frequent use.

What types of ammunition are compatible with the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

The Faxon Duty Series 16" 8.6 BLK AR10 Barrel is chambered for the 8.6 Blackout cartridge. This chambering is compatible with both supersonic and subsonic loads, ranging from 150-180 grain supersonic to 210-300+ grain subsonic rounds. This versatility allows shooters to tailor their ammunition choice to their specific needs, whether for hunting, target shooting, or tactical applications. It's important to note that using the appropriate ammunition ensures optimal performance and accuracy with this barrel.

How does the Faxon Duty Series 16" 8.6 BLK AR10 Barrel perform in suppressed shooting scenarios?

The Faxon Duty Series 16" 8.6 BLK AR10 Barrel is particularly well-suited for suppressed shooting scenarios. Its 1:3 twist rate is optimized for stabilizing heavy subsonic rounds, which are commonly used in conjunction with suppressors to reduce noise. The carbine-length gas system also ensures reliable cycling when using subsonic ammunition, which can sometimes be challenging due to lower gas pressures. This makes the barrel an excellent choice for those looking to build a quiet, effective suppressed AR-10 platform.

What considerations should be made when selecting a muzzle device for the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

When selecting a muzzle device for the Faxon Duty Series 16" 8.6 BLK AR10 Barrel, consider the barrel's M18x1.5-6g threading. This threading is compatible with a variety of muzzle brakes, flash hiders, and suppressor mounts. It's important to choose a device that complements your shooting style and intended use, whether it's reducing recoil, minimizing muzzle flash, or attaching a suppressor. Ensure that the device is properly installed and aligned to prevent any potential issues with accuracy or performance.

What are the benefits of using the 8.6 Blackout cartridge with the Faxon Duty Series 16" 8.6 BLK AR10 Barrel?

The 8.6 Blackout cartridge offers several benefits when used with the Faxon Duty Series 16" 8.6 BLK AR10 Barrel. This cartridge provides excellent versatility, allowing shooters to choose between supersonic and subsonic loads depending on their needs. The heavy subsonic rounds are ideal for suppressed shooting, offering reduced noise without sacrificing performance. Additionally, the cartridge's design allows for effective performance in a variety of shooting scenarios, making it a versatile choice for both tactical and recreational use.

How does the Faxon Duty Series 16" 8.6 BLK AR10 Barrel accommodate different shooting scenarios?

The Faxon Duty Series 16" 8.6 BLK AR10 Barrel is designed to accommodate a wide range of shooting scenarios. Its compatibility with both supersonic and subsonic ammunition, along with the robust construction and versatile gas system, makes it suitable for hunting, tactical, and recreational shooting. The barrel's design ensures reliable performance across different environments and conditions, providing shooters with the flexibility to adapt their AR-10 platform to various applications. However, users should ensure their overall setup, including optics and accessories, is aligned with their specific shooting goals.