FN America 16″ 5.56 Cold Hammer Forged AR-15 M4 Barrel Made from cold hammer forged 41V50 chrome moly vanadium construction and a black manganese phosphate finish. This barrel is chambered in 5.56 NATO with a 1:7 twist rate and 1/2”x28 threads. FN barrels are High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)
These surplus barrels are new and unfired.

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