Faxon Duty Gunner 5.56 Mid-Length .625" - AR-15 Barrel - 12.5"

Get the balance of a Pencil barrel with the strength of a Government contour in a compact 12.5" mid-length gas package. The Faxon Duty Series 12.5" Gunner barrel blends two proven profiles for quick handling and reduced fatigue without sacrificing rigidity where it matters most.

The Faxon Duty Series 12.5" Gunner Profile Barrel is a 4150 CMV button-rifled AR-15 barrel with mid-length gas system, designed for compact carbine, AR pistol, and SBR builds in 5.56 NATO.

You get the Gunner profile that keeps Government-weight steel behind the gas block for rigidity and transitions to Pencil-weight forward for reduced muzzle heaviness and faster handling. Mid-length gas on a 12.5" barrel provides smoother cycling and easier tuning — suppressed or unsuppressed — than shorter carbine or pistol gas systems at this length. The barrel is fully stress-relieved, air-gauge tested, MPI inspected, and finished with an 11-degree target crown for accuracy-focused performance.

• Caliber: 5.56 NATO
• Length: 12.5"
• Profile: Gunner (Government/Pencil Blend)
• Material: 4150 CMV
• Rifling: Button-Rifled, 1:8 Twist
• Finish: Black Nitride (Inside and Out)
• Gas System: Mid-Length
• Gas Block Diameter: .625"
• Gas Block Journal Length: 1.9"
• Muzzle Thread: 1/2-28 TPI
• Barrel Extension: M4
• Crown: 11° Target
• Weight: ~1.22 lbs.
• Inspection: Stress Relieved, Air-Gauge Tested, MPI, Headspace Checked

Compatible with standard AR-15 upper receivers and bolts via the M4 barrel extension. Requires a .625" gas block on the 1.9" journal. The 1/2-28 muzzle threads accept standard brakes, comps, and direct-thread suppressor adapters. Made in Greater Cincinnati, Ohio.

4150 CMV construction with black nitride finish inside and out provides corrosion resistance and extended barrel life. Each barrel is individually headspace-checked with precision gauges before leaving the Faxon facility.

Ideal for compact AR-15 carbine builds, AR pistols, suppressed SBRs, and shooters who want balanced handling in a 12.5" platform with mid-length gas reliability.

Faxon Firearms is a family-owned American manufacturer known for precision-machined AR components. Made in the U.S.A.