The FN America AR-15 Barrel (FN part number 20-100037) is a 10.5-inch, 5.56x45mm NATO barrel built to an M16 profile for carbine-length AR builds. FN cuts it with a 1 in 7-inch right-hand twist, suited to stabilizing a wide range of 5.56/.223 bullet weights, and it ships without sights so builders can add whatever optic or iron sight setup they prefer. As a genuine FN barrel rather than a budget import, it carries the fit and quality control FN is known for on its own rifles.

Key Specifications

• Chambered in 5.56x45mm NATO (.223 Rem/5.56 NATO).
• Barrel length is 10.5 inches.
• Twist rate is 1 in 7 inches, right-hand.
• Profile is M16, a carbine-length configuration.
• Shipping weight is approximately 1.4 lb.
• It ships with no sights, leaving the setup open to the builder.

Frequently Asked Questions

What twist rate does this barrel have? It has a 1 in 7-inch, right-hand twist.

Does this barrel include sights? No, it ships without sights so builders can add their own optic or iron sight setup.

What profile is this barrel? It is an M16 profile, built for carbine-length AR-15 configurations.

Buy the FN AR-15 10.5 Inch Barrel

Build a genuine FN-quality short-barrel AR upper instead of gambling on an unknown import. Browse more of our AR barrel selection and order from our Lubbock, Texas gun shop for fast, direct shipping.