The gunner profile barrel by Faxon Firearms combines the best of two legendary barrel profiles - the robust Gov't and the lightweight Pencil. This innovative design offers the strength and reliability of the Gov't profile, paired with the agility and reduced weight of the Pencil profile, creating a barrel that enhances the balance of your rifle and reduces fatigue, allowing for comfortable shooting, training or hunting throughout the day. Proudly crafted in Cincinnati, Ohio, Faxon barrels are made with precision, using high-quality materials like certified 4150 mil-spec steel or 416-R stainless. Each barrel undergoes rigorous testing, including stress relief, air Gauge testing and an 11 degree target crown, ensuring superior accuracy. With a durable nitride coating and precision headspace checks, every barrel meets the highest standards. The gunner profile barrel is the ideal choice for those seeking a combination of durability, precision and handling ease for an exceptional shooting experience. 11 degree target crown Twist rate - 1:8 Gas block diameter - 3/4 inches Gas block journal length - 1.9 M4 barrel extensions Mid-length, button-rifled, gunner barrel Magnetic particle inspection (MPI) for optimal performance to ensure optimal performance, it is essential to conduct magnetic particle inspection (MPI) with precision and adherence to established protocols This non-destructive testing method is employed to detect surface and near surface discontinuities in ferromagnetic materials By applying a magnetic field to the test object and introducing magnetic particles, any disruptions in the magnetic field caused by defects become visible, allowing for accurate identification and assessment Proper execution of MPI requires a thorough understanding of the equipment, materials and techniques involved, as well as strict compliance with safety standards and guidelines