Faxon Firearms 15A58R20NGQ Duty Series 5.56x45mm NATO 20″ Target Crown Steel QPQ Black Nitride 4150 Steel Barrel Fits AR15/M16

Overview

The Faxon Firearms Duty Series 20-inch barrel is chambered for 5.56x45mm NATO and features the Gunner profile, which blends the durability of a government profile with the weight savings of a pencil profile to improve rifle balance and reduce shooter fatigue. Constructed from 4150 steel and finished with a QPQ Black Nitride coating, the barrel is stress-relieved, air-gauge tested, and button rifled to ensure accuracy and longevity. Designed for AR-15/M16 platforms, the barrel features an 11-degree target crown, a 1:8 twist rate, and a 1/2-28 thread pattern. The assembly includes a 0.625-inch gas block journal and an M4 barrel extension. Each barrel undergoes individual headspacing checks with precision gauges, making it a reliable choice for tactical, competitive, or hunting applications.

Price & Stock History

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