Faxon .300 BLK 9" Gunner 5R Match Series Barrel

Faxon .300 BLK 9″ Gunner 5R Match Series Barrel

5R rifling, 11-degree target crown, MPI inspected.

The Faxon .300 BLK 9″ Gunner 5R Match Series Barrel is the perfect solution for builders seeking optimal performance from a compact AR pistol or SBR chambered in .300 Blackout. Designed and manufactured entirely in-house from 416R stainless steel, this barrel features Faxon’s renowned Gunner profile, blending lightweight design with superior accuracy and reliability. It’s treated with a QPQ Nitride finish inside and out for exceptional corrosion and wear resistance.

This barrel features 5R button rifling, a method known for improving bullet stability, reducing copper fouling, and extending barrel life. The 1:8 twist rate is optimized for subsonic and supersonic .300 BLK loads, making it incredibly versatile whether you’re running suppressed or unsuppressed. The included Nickel Teflon coated M4 feed ramp extension improves reliability with a wide range of ammo, particularly in fast-cycling platforms.

Configured with a Pistol-length gas system, the Faxon .300 BLK 9″ Gunner barrel ensures reliable cycling with subsonic ammunition and suppressed setups. It’s also individually MPI inspected and headspace-checked for safety and long-term durability, making it one of the most dependable options for a .300 Blackout pistol or short-barreled rifle build.

What makes the Gunner profile so effective?

The Gunner profile combines the strength of a Government taper near the chamber with the lightweight feel of a Pencil contour near the muzzle. This design keeps more material near the receiver, where heat builds up most, and trims weight near the muzzle to reduce front-end fatigue and improve maneuverability. The result is a well-balanced barrel that maintains accuracy and heat control during extended use.

Why choose 5R rifling?

5R rifling features five lands and grooves that are offset from each other, along with sloped sides that minimize bullet distortion. This results in less fouling, easier cleaning, and improved accuracy over the life of the barrel. It’s a favorite among competitive shooters and those building high-performance duty rifles alike.

Barrel Features:

• 416R Stainless Steel – Match-grade performance
• 5R Button Rifled – Improved accuracy and barrel life
• QPQ Nitride Finish – Corrosion and wear resistant
• Nickel Teflon Coated M4 Feed Ramp Extension – Enhanced reliability
• 1:8 Twist Rate – Optimized for .300 BLK subsonic and supersonic loads
• Pistol-Length Gas System – Ideal for suppressed builds
• Gunner Profile – Lightweight and thermally efficient
• 11-Degree Target Crown – Consistent muzzle exit for accuracy
• MPI Inspected and Headspace Verified

Technical Specifications:

• Caliber: .300 AAC Blackout
• Barrel Length: 9″
• Profile: Gunner
• Material: 416R Stainless Steel
• Finish: QPQ Nitride
• Rifling: 5R Button Rifled
• Twist Rate: 1:8 RH
• Gas System: Pistol-Length
• Gas Block Journal: 0.625″
• Crown: 11-Degree Target Crown
• Feed Ramp: M4, Nickel Teflon Coated

If you’re planning a suppressed .300 BLK build or want an ultra-reliable short barrel for duty or defensive use, the Faxon .300 BLK 9″ Gunner 5R Match Series Barrel delivers top-tier performance. We are always here to help!