Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded AR Barrel 13.9in Mid Length 1-8 Twist 1/2x28 Chrome Phosphate Black

Name: Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded AR Barrel 13.9in Mid Length 1-8 Twist 1/2x28 Chrome Phosphate Black
Brand: Lead & Steel
Availability: InStock

Lead & Steel · Barrels

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Best price

$349.99at OpticsPlanet

In stock Sale checked Oct 12, 2026

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Where to buy

Store	Price	Availability	Buy	Add to build
OpticsPlanet	$349.99Salechecked Oct 12, 2026	In stock	Buy at OpticsPlanet

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Lowest in-stock price in the last 30 days: $349.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Oct 12, 2026.

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Store	Latest	Lowest	Highest
OpticsPlanet	$349.99	$349.99	$349.99

Since Oct 12, 2026.

About this part

The Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded AR Barrel 13.9in Mid Length 1-8 Twist 1/2x28 Chrome Phosphate Black is a 13.9" 5.56 / .223 barrel from Lead & Steel with a mid-length gas system. One store lists it, OpticsPlanet at $349.99. The lowest in-stock price in the last 30 days was $349.99 at OpticsPlanet.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Gas system: Mid-length · Handguards
Muzzle thread: 1/2x28 · Muzzle devices
Barrel length: 13.9" · Handguards

Specifications

Manufacturer: Lead & Steel
Color: Black
Platform: AR-15
Caliber: 5.56 mm NATO
Gas system: Mid
Barrel length: 13.9"
Twist rate: 1:8
Thread pattern: ½ x 28

From the manufacturer

Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded AR Barrel 13.9in Mid Length 1-8 Twist 1/2x28 Chrome Phosphate Black. Chambered in 5.56 NATO/223 Rem the 4150 Chromoly Vanadium barrel comes in various lengths. This barrel features a 1:8 twist ratio and a mid-length gas system with a manganese phosphate coated exterior chrome lined bore and match crown for maximum service life EXCLUSIVE to Lead & Steel All HM Defense barrels are match-grade tripled-honed and button-rifled for superior accuracy. All barrels feature Mil-spec M4 feed ramp extensions properly installed & head spaced. Specifications for Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded Barrel: Manufacturer: Lead & Steel Color: Black Finish: Chrome Phosphate Fabric/Material: 4150 Chrome-Moly Vanadium Steel Caliber: 5.56mm .223 Remington Barrel Length: 13.9 in Barrel Profile: Medium Gas System Length: Mid Length Gas Block Journal Size-Diameter: .750 in Barrel Twist Rate: 1-8 Flutes: No Gun Make: AR Platform Gun Model: AR-15 Weight: 26 oz Firearms Threads Per Inch: 1/2x28 Features of Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded Barrel Gas block integrally machined as part of barrel. Eliminates gas block installation and alignment. Improved barrel harmonics for better accuracy. Dependable performance in severe conditions. Low profile; clears barrel nut and allows rail swap if pinning and welding muzzle device. Chrome lining lightweight tapering and target crowning EXCLUSIVE to Lead & Steel Package Contents: Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded Barrel What firearm models does the manufacturer say Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded Barrel is compatible with? The manufacturer suggests that Lead & Steel MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded Barrel is compatible with AR-15Lead & Steel 111322: MonoBloc M4/AR-15 5.56mm/.223 Remington Threaded AR Barrel 13.9in Mid Length 1-8 Twist 1/2x28 Chrome Phosphate Black