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The Faxon Duty Series Gunner Barrel for the 5.56x45mm is manufactured 100% in-house from cradle-to-grave. The barrel is machined from certified 4150 steel with QPQ nitride coating for added durability and longevity. Each barrel is magnetic particle inspected (MPI) to ensure perfect surfaces and sub-surfaces as well as air-gauge tested to ensure superior accuracy.
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