Faxon Firearms Gov'T/Socom Duty Series 5.56 Nato 10.5" Black Nitride 4150 Cmv

The Faxon Firearms Gov't/SOCOM Duty Series 5.56 NATO 10.5" barrel is a short-barrel rifle (SBR) and pistol platform choice that balances accuracy with practical weight for shooters running compact AR-15 builds. Built from 4150 CMV steel and finished inside and out with QPQ Nitride coating, this barrel delivers the corrosion resistance and durability serious shooters expect in a duty or tactical setup. The Gov't/SOCOM profile—thinner behind the gas block, beefier forward of it—gives you the rigidity needed for consistent accuracy without the bulk of a heavy profile barrel.

Faxon subjects every barrel to magnetic particle inspection and individual headspace verification using precision custom hardened gauges. The stress-relieved construction and air-gauge testing at each manufacturing step ensure the kind of quality control you need when building a rifle you'll actually trust. The 1-8" twist rate stabilizes a wide range of 5.56 projectiles, and the 11-degree target crown protects accuracy at the muzzle while the M4-type feed ramps ensure reliable feeding across ammunition types.

Whether you're building a short-barreled rifle for home defense, a compact range gun, or a truck gun that doesn't hog space, this 10.5" barrel delivers the performance and durability Faxon is known for. The 1/2"-28 tpi threading accepts standard muzzle devices, and the .750" gas block shoulder diameter works with most common handguards and rail systems.

Key Features

• 4150 CMV steel with QPQ Nitride coating inside and out for exceptional corrosion and wear resistance
• Gov't/SOCOM profile: slimmer behind gas block, thicker forward for balanced rigidity and weight
• Stress-relieved construction and magnetic particle inspected for reliability
• 1-8" twist rate button rifled for stable flight across a wide range of 5.56 loads
• 11-degree target crown to preserve accuracy and protect the muzzle
• M4-type feed ramps for reliable chambering
• Individual headspace verification on precision custom hardened gauges
• 1/2"-28 tpi muzzle threading for standard suppressors and brakes

Specifications

Frequently Asked Questions

What's the Gov't/SOCOM profile, and why does it matter?

The Gov't/SOCOM profile is a hybrid design: it's thinner behind the gas block (like a standard M4 profile) to keep weight down, then thicker forward of the gas block for improved rigidity and accuracy. This balance works well for short-barrel builds where you want a handling advantage without sacrificing shot consistency.

Will this barrel work with my AR-15 handguard and gas block?

Yes. The .750" gas block shoulder diameter accommodates most common handguard and gas block systems. The 1.9" gas block journal length is standard M4-spec. You'll need a muzzle device with 1/2"-28 tpi threading, which is the standard for 5.56 platforms.

Is this barrel suitable for a short-barreled rifle (SBR)?

At 10.5", this barrel is commonly used in SBR builds and pistol platforms. The 1-8" twist and M4 feed ramps are designed to run reliably in compact setups. Be sure you comply with all federal and local regulations regarding barrel length and registration if applicable.

What does magnetic particle inspection mean?

Magnetic particle inspection (MPI) is a non-destructive test that detects surface and subsurface flaws in steel. Every Faxon barrel undergoes MPI to catch any defects before it ships, along with individual headspace verification and air-gauge testing. This level of quality control ensures a reliable, safe barrel.