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

Elevate your AR-15 build with the FN America AR15 Barrel 18″ BB M16 5.56 RIFLE, a precision-engineered component designed for unmatched reliability and performance. Crafted by FN America, a leader in firearms manufacturing, this 18-inch barrel delivers the velocity and accuracy demanded by tactical enthusiasts, competitive shooters, and duty-focused users. Whether you’re assembling a custom rifle for range days or long-distance precision, this barrel ensures consistent results with its military-grade construction and proven durability.

Key Features

• Chrome-Lined Bore and Chamber: Provides superior resistance to corrosion and heat erosion, extending barrel life and ensuring reliable chambering and extraction even after thousands of rounds.
• M4-Style Feed Ramps and Extension: Enhances smooth and consistent feeding, reducing malfunctions and improving overall reliability in high-stress scenarios.
• Matte Black Manganese Phosphate Finish: Offers excellent protection against external corrosion and oxidation, maintaining peak performance in harsh environments.
• High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI): Rigorous testing guarantees freedom from micro-stresses or flaws, delivering consistent quality and safety.
• Button-Rifled Construction: Utilizes premium U.S.-sourced Chrome Moly Vanadium steel per Mil-B-11595E standards for exceptional accuracy and longevity.

Technical Specifications

• Barrel Length: 18 inches
• Profile: M16 Government (balanced for heat dissipation and stability)
• Caliber: 5.56x45mm NATO
• Gas System: Rifle length (softer recoil and reduced wear on components)
• Twist Rate: 1:7 (optimal for stabilizing a wide range of 5.56 ammunition)
• Thread Pitch: 1/2″ x 28 TPI (compatible with most muzzle devices)
• Weight: 27.5 oz
• Finish: Matte black manganese phosphate

Why Choose This FN America Barrel?

The 18-inch length maximizes muzzle velocity for enhanced terminal ballistics, making it ideal for varmint hunting, target shooting, or defensive applications where precision matters. The rifle-length gas system minimizes felt recoil and gas blowback, allowing for faster follow-up shots and greater shooter comfort during extended sessions. Built to military specifications, this barrel addresses common pain points like premature wear and inconsistent accuracy by combining robust materials with advanced testing—outlasting lesser options in demanding conditions. For AR-15 builders seeking a drop-in upgrade that boosts performance without compromising on quality, the FN America 18″ M16 profile barrel stands out as a smart investment in reliability and precision.

Transform your AR-15 into a high-performing powerhouse. Add the FN America AR15 Barrel 18″ BB M16 5.56 RIFLE to your build today and experience the difference that premium engineering makes.

Frequently Asked Questions

Q: What makes this barrel suitable for high-round-count use?
A: The chrome-lined bore and chamber resist heat and corrosion, while HPT and MPI testing ensure structural integrity, making it ideal for sustained shooting without degradation.

Q: Is this barrel compatible with standard AR-15 platforms?
A: Yes, it fits mil-spec AR-15 upper receivers and uses a standard 1/2″ x 28 thread pitch for easy integration with common muzzle devices and suppressors.

Q: Does the rifle-length gas system affect recoil?
A: Absolutely—it provides a smoother cycling action with less recoil impulse compared to shorter gas systems, improving control and accuracy for the user.