


Product Description
The FN America AR-15 premium button rifled barrel is built to military specifications for dependable accuracy, long service life, and hard-use reliability. Manufactured from U.S.-sourced Chrome Moly Vanadium steel (Mil-B-11595E), each barrel is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) to help ensure consistent quality and structural integrity. A chrome-lined bore and chamber improve corrosion resistance and reduce heat erosion for extended barrel life, while M4-style feed ramps support smooth, reliable feeding. Finished in a matte black manganese phosphate coating for external corrosion resistance, this 18-inch, rifle-length gas barrel is a strong choice for precision-focused AR-15 builds.
Product Highlights
- 18-inch 5.56 NATO AR-15 barrel with rifle-length gas system for smooth cycling and controllable recoil impulse
- Chrome Moly Vanadium steel construction made to Mil-B-11595E standards for durability and performance
- Chrome-lined bore and chamber enhance corrosion resistance and extend barrel life
- HPT and MPI inspected to verify integrity and help eliminate micro-stresses or manufacturing flaws
- M4-style feed ramps and matte black manganese phosphate finish for reliable operation and corrosion protection
Specs
- Brand: FN America
- Manufacturer Part Number: 20-100042
- UPC: 845737008468
- Caliber: 5.56 NATO
- Barrel Length: 18 in
- Gas System Length: Rifle-Length
- Barrel Contour/Profile: M16 Profile
- Rifling Method: Button rifled / button broached
- Twist Rate: 1:7
- Bore & Chamber: Chrome-lined
- Material: Chrome Moly Vanadium steel
- Feed Ramps: M4 style
- Finish: Matte black manganese phosphate
- Testing: High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)
- Muzzle Threads: 1/2x28
- Gas Block Journal Diameter: .750
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