Introducing the pinned gas block barrel by Faxon Firearms - a meticulously engineered solution designed to enhance your shooting experience with unparalleled reliability and precision. Our innovative design incorporates both set screws and a pre-notched gas block journal, ensuring your gas block remains securely in place, eliminating any concerns of shifting or loosening during firing. Each barrel is crafted from top-tier materials, offering you a choice between certified 4150 mil-spec steel or 416-R stainless, ensuring durability and performance. Our manufacturing process is rigorous, with each barrel undergoing comprehensive stress relief, air Gauge testing and an 11 degree target crown to deliver exceptional accuracy. The pinned gas block barrel package includes a low-profile gas block, pre-drilled to align perfectly with the barrel's notches and a pin for secure installation. For your convenience, gas blocks are hand-tightened to the barrel for safe shipping. At Faxon Firearms, quality is our hallmark. Our barrels are manufactured in-house, subjected to a series of stringent tests at every stage of production and finished with a nitride coating for enhanced longevity. Each barrel is individually checked for headspace using precision custom hardened Gauges, ensuring you receive a product that meets the highest standards of excellence. Experience the pinnacle of value and performance with Faxon Firearms' pinned gas block barrels - where innovation meets precision. 11 degree target crown Twist rate - 1:8 Gas block diameter - 0.625 inches 1.1 gas block journal length M4 barrel extensions Mid-length, button-rifled, pencil 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