The FN America AR-15 Barrel (FN part number 20-100041) is a 16-inch, 5.56x45mm NATO barrel built to an M16 profile with a mid-length gas system, a popular combination for a soft-shooting, standard-length AR-15. 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 16 inches.
• Twist rate is 1 in 7 inches, right-hand.
• Profile is M16 with a mid-length gas system.
• Shipping weight is approximately 2.05 lb.
• It ships with no sights, leaving the setup open to the builder.

Frequently Asked Questions

What gas system does this barrel use? It uses a mid-length gas system, a popular choice for a 16-inch AR-15 barrel.

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

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

Buy the FN AR-15 16 Inch Barrel

Build a genuine FN-quality standard-length 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.