FN 20-100042 AR-15 Barrel 18" 5.56 NATO M16

FN AR-15 Premium Rifle Barrel

FN's 18" AR-15 barrel represents serious manufacturing quality backed by decades of military and law enforcement experience. This is a purpose-built component for shooters who demand consistency and reliability.

Construction & Materials

U.S. Sourced Chrome Moly Vanadium Steel manufactured to Mil-B-11595E specifications. Every barrel undergoes rigorous quality control:

• High Pressure Testing (HPT) to verify structural integrity
• Magnetic Particle Inspection (MPI) to detect micro-stresses and flaws
• Chrome-lined bore and chamber for extended barrel life

Performance Features

• 18" barrel length with rifle-length gas system for optimal velocity and reliability
• M16 profile contour provides classic AR-15 handling characteristics
• 1:7 twist rate stabilizes a wide range of 5.56 NATO ammunition weights
• M4-style feed ramps ensure consistent feeding with modern ammunition
• Manganese Phosphate finish resists corrosion and oxidation

Why This Barrel Matters

The combination of chrome-lined bore, button-rifling precision, and mil-spec materials means you get a barrel that handles heat, resists erosion, and maintains accuracy through extended shooting sessions. Whether you're building a precision rifle or upgrading an existing platform, this FN barrel delivers the reliability you expect from a manufacturer trusted by professional shooters worldwide.