Name: Geissele Automatics 13.9" 5.56 NATO CHF Chrome-Lined Mid-Length Barrel - 05-2989
Brand: Geissele Automatics
SKU: 05-2989
Price: 355 USD
Availability: InStock

Geissele Automatics 13.9" 5.56 NATO CHF Chrome-Lined Mid-Length Barrel - 05-2989

MSRP: $385.00

$355.00

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Product Description

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Geissele Automatics Rifle Barrel 5.56 NATO 13.9 Cold Hammer Forged Barrel 1 2X28 Thread Pitch Fits AR 15 Chrome Lined Geissele Taper Profile Mid Length Gas System Manganese Phosphate Finish Black 05 2989 UPC 810081134958

Product Description

The Geissele Automatics 13.9" 5.56 NATO Cold Hammer Forged (CHF) Barrel (05-2989) is a premium match-grade rifle barrel purpose-built for hard-use AR-15 carbine builds, recce rifles, and pin-and-weld tactical setups. Precision cold hammer forged from high-grade Chrome Moly Vanadium steel, this 13.9-inch barrel combines extreme thermal resistance, superb accuracy, and an exceptionally long service life under heavy, rapid-fire operational cycles.

Featuring Geissele's proprietary Taper Profile, weight is optimized toward the chamber to shift balance rearward while maintaining structural stiffness near the muzzle. The interior bore and chamber are lined with a thick layer of industrial hard chrome—double the thickness of standard mil-spec chrome lining—to withstand high-velocity gas erosion and facilitate rapid chamber cleaning. The exterior surface is sealed in a corrosion-resistant manganese phosphate coat, giving it a durable matte black tactical finish.

Engineered around a mid-length gas system for smooth cycling and reduced internal bolt carrier velocity, the 13.9" length is widely preferred for custom builds because pinning and welding a standard muzzle device (such as a SureFire Warcomp or Dead Air KeyMo adapter) easily achieves the legal 16-inch rifle barrel threshold without NFA SBR tax stamps.

Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard mil-spec AR-15 upper receivers. Requires a 0.750" gas block journal and a mid-length gas tube. Threaded 1/2"-28 TPI for standard 5.56 muzzle devices. Ideal length for pin-and-weld configurations to achieve 16" total barrel length.

Perform a complete firearm safety check: drop the magazine, lock the bolt rearward, and visually inspect the chamber to verify zero live rounds are present.

Apply a thin layer of aerosol grease or high-temperature anti-seize to the upper receiver threads and barrel extension.

Insert the barrel extension into the upper receiver indexing slot, ensuring the alignment pin engages without canting.

Thread the barrel nut onto the receiver and torque to manufacturer specs (30–80 ft-lbs using the proper armorers wrench).

Install a 0.750" low-profile gas block and mid-length gas tube, ensuring correct gas port alignment before securing set screws or taper pins.

Verify headspace using 5.56 NATO GO/NO-GO gauges with your bolt carrier group prior to live-fire testing.

Key Features

Cold Hammer Forged (CHF) Construction: Forged under thousands of pounds of pressure to refine steel grain structure for extreme barrel longevity and accuracy.
Double-Thick Chrome Lined Bore & Chamber: Hard chrome lining increases heat and wear resistance well beyond standard military specifications.
13.9" Ideal Length for Pin & Weld: Designed specifically to reach a legal 16" overall length when permanently affixing extended muzzle devices.
Geissele Proprietary Taper Profile: Optimizes weight distribution for enhanced balance, improved maneuverability, and reduced heat deflection.
Smooth Mid-Length Gas System: Softens recoil impulse, reduces wear on internal receiver components, and ensures reliable operation across ammo types.
Manganese Phosphate Exterior Finish: Mil-spec phosphate surface treatment provides superior rust resistance and oil retention in harsh environments.