SKU: FN20-10004
The FN America Barrel M16 Rifle Length 5.56 is a mil-spec barrel assembly engineered for operators, law enforcement, and serious rifle builders who demand proven reliability and accuracy. FN barrels represent the gold standard in military small arms manufacturing, with production methods and quality control derived directly from military contract specifications. This rifle-length barrel (typically 20 inches) is optimized for the 5.56 NATO cartridge and delivers the velocity and sight radius necessary for precision work at extended ranges.
The rifle-length gas system configuration provides consistent cycling and reduced bolt carrier group stress compared to shorter systems, a measurable advantage during high round-count training and sustained operations. The 5.56 NATO caliber offers established logistics support, cost-effective ammunition availability, and ballistic performance suitable for defensive and tactical applications. FN's manufacturing tolerances ensure compatibility with standard M16/AR-15 upper receiver assemblies, gas tubes, and furniture without requiring custom fitting or modification.
This barrel assembly serves law enforcement duty rifles, military trainers, precision competition shooters, and civilian rifle builders who prioritize accuracy and reliability. The rifle-length gas system is the original M16 platform geometry, making it ideal for those rebuilding or maintaining inventory rifles to original specifications. Operators familiar with M16A4 or M16A2 platforms recognize this barrel as a direct-fit replacement component that maintains handling characteristics and sight picture geometry established by decades of field use.
The 5.56 NATO cartridge remains the standard across NATO forces, federal agencies, and professional tactical units, ensuring ammunition availability and platform familiarity. FN barrels are manufactured to MILSPEC standards and undergo rigorous testing for headspace, bore dimensions, and material properties before delivery, making them a trusted choice for mission-critical builds and duty weapons.
WARNING ⚠️
You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
Purchasing a Firearm? Click HERE to see our firearm purchasing guide.
