FN AR15 premium button rifled barrels are are manufactured using U.S. sourced Chrome Moly Venadium material per Mil-B-11595E. Each barrel is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) to ensure that it is free of microstresses or flaws, resulting in consistency and quality in every barrel shipped from the factory. The bore and chamber are chrome lined to help resist corrosion and provide resistance to heat erosion which greatly improves barrel life and reliable chambering / extraction. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation.
Specifications:

Caliber or Gauge
Length	18"
Model	AR-15
Twist
Sights
Bore Type
Finish	Manganese Phosphate
Type
Chokes Included
Choke Configuration
Barrel Type	Rifle Length
Ammo Type
Barrel Features	Chrome-Lined