16" 5.56mm 1:7 Twist M4 4150 Lightweight Pencil Barrel

Trim weight without sacrificing durability or accuracy with the Always Armed 16" 5.56mm Lightweight Pencil Barrel. Proudly Made in the USA, this 16-inch barrel is purpose-built for ultra-light AR-15 builds, offering effortless handling, rapid target acquisition, and all-day carry comfort without heavy front-end drag.

Precision-machined from tough 4150 Chromoly Steel, this barrel features an M4 Contour Lightweight Pencil Profile engineered to shed maximum ounces while maintaining excellent structural integrity. The advanced Black Nitride coating protects both the interior bore and exterior surface with an ultra-hard, corrosion-resistant finish that resists wear and harsh environmental elements.

Chambered in 5.56x45mm NATO (safely firing both 5.56 NATO and .223 Remington), it incorporates precision-cut M4 feed ramps for ultra-reliable feeding and features custom caliber markings spiral engraved near the muzzle break.

Driven by a smooth mid-length gas system on a lightweight .625" gas platform, it offers reduced recoil impulse and smoother cycling compared to carbine-length gas setups. The fast 1:7 right-hand twist rate effortlessly stabilizes a wide range of projectile weights, particularly heavier 62gr, 69gr, and 77gr duty ammo. Standard 1/2x28 TPI threads ensure broad compatibility with standard 5.56 muzzle brakes, flash hiders, and suppressors.

Technical Specifications

• Brand: Always Armed
• Caliber: 5.56x45mm NATO (Safely chambers .223 Rem)
• Length: 16 Inches
• Material: 4150 Chromoly Steel
• Finish: Black Nitride Coating
• Profile: M4 Contour / Lightweight Pencil
• Twist Rate: 1:7
• Gas System: Mid-Length
• Gas Block Journal: .625"
• Feed Ramps: M4
• Thread Pitch: 1/2x28 TPI
• Markings: Spiral Engraved Near Break
• Origin: Made in the USA
• Platform: AR-15 Upper Receivers