FN 20-100043 AR-15 Barrel 20" 5.56 NATO M16

FN AR-15 Premium Rifle Barrel

This FN barrel represents the kind of precision engineering that separates quality AR-15 components from the merely adequate. Built to exacting military specifications, it delivers the consistency and reliability that serious shooters demand.

Construction & Materials

Chrome Moly Vanadium Steel: Manufactured from U.S. sourced material per Mil-B-11595E specifications, the same standard used in military rifle production.

Chrome-Lined Bore: The chrome lining provides exceptional corrosion resistance and heat erosion protection, extending barrel life and ensuring reliable chambering and extraction cycle after cycle.

Button Rifling: Precision button-rifled construction creates consistent rifling geometry for superior accuracy potential.

Quality Assurance

Every barrel undergoes rigorous testing:

• High Pressure Testing (HPT): Validates structural integrity under extreme conditions
• Magnetic Particle Inspection (MPI): Detects microscopic flaws and stress points before they become problems

This two-stage inspection process ensures you receive a barrel free of defects that could compromise accuracy or safety.

Specifications

• Caliber: 5.56 NATO
• Length: 20"
• Twist Rate: 1:7
• Profile: M16 contour
• Gas System: Rifle length
• Feed Ramps: M4 style for reliable feeding
• Finish: Matte black Manganese Phosphate

The Manganese Phosphate finish resists external corrosion and oxidation, maintaining appearance and protection through years of use.

The Right Choice

Whether you're building a precision rifle or upgrading an existing platform, this FN barrel provides the foundation for consistent, reliable performance.