This guide details AR-15 barrel materials and manufacturing processes. 4150 steel, especially Mil Spec variants, offers superior wear and longevity, often enhanced by chrome lining or Melonite treatment. Stainless steel (like 416R) excels in accuracy due to even throat erosion. Cold Hammer Forged (CHF) barrels provide maximum durability for high-volume use. Quality control steps like HPT and MPI are crucial.
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