FN M16 Contour 18" 5.56 NATO Barrel - Rifle Length Gas System

M16 Contour 18" 5.56 NATO Barrel - Rifle Length Gas System

The FN America 18” 5.56 NATO barrel is designed to meet military specifications while offering exceptional durability, accuracy, and long service life. Manufactured with U.S.-sourced Chrome Moly Vanadium steel, this barrel undergoes High Pressure Testing (HPT) and Magnetic Particle Inspection (MPI) to ensure flawless integrity, micro-stress resistance, and consistency.

Its rifle-length gas system, M16 contour, and chrome-lined bore and chamber make it ideal for enhanced reliability, smoother cycling, and extended barrel longevity—perfect for precision builds, duty rifles, or competition setups.

18" Chrome Moly Vanadium Steel Barrel
Manufactured to Mil-B-11595E standards for toughness and reliability.

Rifle-Length Gas System
Provides smooth operation and reduced recoil impulse for superior performance.

Button Broached Rifling
Ensures consistent accuracy and stability.

1:7 Twist Rate
Optimized for heavier projectiles (62gr and above), improving precision at longer ranges.

High Pressure Tested (HPT) & Magnetic Particle Inspected (MPI)
Guarantees structural integrity and flaw-free manufacturing.

Chrome-Lined Bore & Chamber
Enhances corrosion resistance and heat durability, extending barrel life.

M4 Feed Ramps & Barrel Extension
Improves consistent and reliable feeding.

Matte Black Manganese Phosphate Finish
Protects against wear, oxidation, and environmental elements.

Fits AR-15 Platforms
Seamlessly integrates into custom and factory-built rifles.

Specifications

• Caliber: 5.56 NATO
• Twist Rate: 1:7
• Gas System: Rifle-Length
• Rifling Method: Button Broached
• Bore & Chamber Lining: Chrome-Lined
• Barrel Contour: M16 Profile
• Feed Ramps: M4 Style
• Finish: Matte Black Manganese Phosphate
• Material: Chrome Moly Vanadium Steel
• Testing: HPT & MPI Certified