FNH USA FN15/AR Upper Receiver Assemblies - Built to meet the demands of Law Enforcement and military operators, competitors and sportsmen alike, FN complete upper assemblies have been designed with your needs in mind. Precise quality and compliance criteria ensure the highest degree of engineering and craftsmanship is employed in production and testing to secure consistent optimum performance.
AR-15, Issue:11, Page:005
Big Book Catalog, Issue:72, Page:004
SPECS: Barrel: Barrel Length – 20”. Cold Hammer Forged Proprietary CrMoV Barrel Steel . Hard-Chrome Lined to MIL-STD 171. M4 Feed Ramps. High Pressure Tested. Magnetic Particle Inspected (MPI). Manganese Phosphate Finish. Chambered in 5.56X45mm. 1:7 RH Twist. Bolt Carrier Group: M16/Auto Bolt Carrier Assembly . Carpenter 158 Bolt. Bolt is Magnetic Particle Inspected (MPI). Staked Gas Key.