FN America AR15 Barrel 18" BB M16 5.56 RIFLE - 20-100042

Elevate your AR-15 build with the FN America 18-inch Button Broached M16 Barrel in 5.56 NATO, engineered for unmatched reliability and precision. Crafted by FN America, a leader in military-grade firearms components, this barrel delivers the performance demanded by serious shooters who refuse to compromise on quality. Whether you’re assembling a custom rifle for range days, tactical training, or competition, this 18-inch powerhouse offers optimal velocity and accuracy without the excessive recoil of shorter barrels.

Key Features

• Button Broached Rifling: Provides smooth, consistent bullet stabilization for reliable feeding and enhanced accuracy across various ammunition types.
• Chrome-Lined Bore and Chamber: Ensures exceptional resistance to heat erosion and corrosion, extending barrel life even under intense use.
• M4-Style Feed Ramps and Extension: Promotes seamless ammunition cycling, reducing malfunctions and boosting operational efficiency.
• Manganese Phosphate Finish: Matte black coating shields against external oxidation and environmental damage, ideal for all-weather reliability.
• Rifle-Length Gas System: Delivers a smoother shooting experience with reduced felt recoil, perfect for extended sessions.

Technical Specifications

• Caliber: 5.56x45mm NATO / .223 Remington
• Barrel Length: 18 inches
• Twist Rate: 1:7 RH – Stabilizes a wide range of bullet weights from 55 to 77 grains
• Profile: M16 Government Contour for balanced weight and heat dissipation
• Material: High-strength alloy steel construction
• Weight: Approximately 27.5 oz – Lightweight yet durable for maneuverable builds
• Gas System Length: Rifle
• Thread Pitch: 1/2″ x 28 TPI for versatile muzzle device compatibility

Why Choose the FN America 18-Inch 5.56 Barrel?

In the world of AR-15 barrels, durability and precision are non-negotiable. This FN America barrel addresses common pain points like premature wear from corrosive environments or inconsistent performance with mixed ammo loads. Its chrome lining and phosphate finish provide superior protection, while the 18-inch length maximizes 5.56 NATO ballistics for effective engagement at distances up to 500 yards. Shooters appreciate the rifle-length gas system’s gentler recoil impulse, which minimizes fatigue during prolonged shooting. Compared to generic options, FN’s military-proven engineering ensures sub-MOA potential when paired with quality components, making it a smart investment for enthusiasts seeking tactical-grade performance without the premium price tag of match-grade alternatives.

Transform your AR-15 into a precision instrument built to last. Secure your FN America 18-inch Barrel today and experience the difference in every shot.

Frequently Asked Questions

Q: What bullet weights does the 1:7 twist rate handle best?
A: The 1:7 RH twist excels with heavier 5.56 bullets, typically 62-77 grains, offering superior stabilization for match or tactical loads while still performing well with lighter 55-grain options.

Q: Is this barrel compatible with standard AR-15 uppers?
A: Yes, it fits mil-spec AR-15 platforms with a rifle-length gas tube. Ensure your upper receiver and bolt carrier group are properly aligned for optimal function.

Q: How does the chrome lining benefit long-term use?
A: Chrome lining resists corrosion from moisture and residue, while improving chambering reliability and barrel longevity, even after thousands of rounds.