FAXON .300 BLK AR-15 Duty Series Pistol Looping Loop 10.5"

The Faxon Duty Series 10.5" Gunner 300 BLK barrel combines exceptional balance and durability for short, versatile builds. Our Gunner profile merges the robustness of a Gov’t contour with the lightweight maneuverability of a Pencil profile—ideal for CQB, suppressed, or compact rifle setups. Machined from 4150 CMV steel and button rifled with a 1:8 twist, each barrel is fully stress relieved and treated with salt bath nitride inside and out for superior corrosion resistance and long service life. Every Faxon barrel is air-gauge tested, MPI inspected, and headspace checked for reliability and accuracy straight out of the box. Key Benefits: Gunner Profile: Combines Gov’t strength with Pencil weight savings for excellent balance.Pistol-Length Gas: Optimized for 300 BLK reliability with subsonic and supersonic loads.4150 CMV Construction: Mil-spec steel for rugged performance and heat resistance.Nitride Finish: Salt bath nitride inside & out enhances longevity and corrosion protection.Quality Control: Stress relieved, air-gauge tested, MPI, and headspace verified. Specifications: Caliber: .300 AAC BlackoutLength: 10.5"Profile: GunnerMaterial: 4150 CMVRifling: Button-rifled, 1:8 twistFinish: Black Nitride (inside & out)Gas System: Pistol-LengthGas Block Diameter: .750"Gas Block Journal Length: 1.9"Muzzle Thread: 5/8-24 UNEFBarrel Extension: M4Weight: 1.10 lbQuality & InspectionStress relieved, air-gauge tested, magnetic particle inspected, headspace checkedMuzzle: 11° target crown Why Choose Faxon Duty Series: From certified 4150 CMV bar stock to final inspection, each Faxon Duty Series barrel is manufactured and quality-checked in-house. Overview: The Faxon Duty Series 10.5" Gunner 300 BLK is a durable, accurate foundation for compact AR-15 builds. Its Gunner profile preserves strength where it counts and trims forward weight for excellent balance. Constructed from 4150 CMV with a 1:8 twist and nitride inside & out, it’s built for high round counts and easy maintenance.Each barrel is stress relieved, air-gauge tested, magnetic particle inspected, and individually headspace checked. The .750" gas block journal, pistol-length gas, and 5/8x24 threads integrate seamlessly with modern .30-cal devices and suppressor systems—making it a top choice for do-it-all 300 BLK builds. Installation & Compatibility: Compatible with standard AR-15 Mil-spec upper receivers and bolts using the M4 barrel extension.Use a .750" gas block (set-screw or clamp-on) on the 1.9" journal.Confirm muzzle device/suppressor compatibility with 5/8-24 threading. Always verify suppressor caliber rating.For optimal reliability, tune buffer/spring and gas settings to your specific ammunition and muzzle device. Informations: Serial number engraving included. If you don’t want this, you must inform us before placing your order!C.I.P. proof NOT includedFor compatible accessories, see accessories under this article