Description Bolt assembly machined from either Mil-Spec Carpenter 158® steel, shot peened for increased strength per Mil-Spec, includes Mil-Spec 4140 billet tool steel extractor w/ spring and viton o-ring, Mil-Spec ejector and spring. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected). Complete Mil-Spec Bolt includes: Mil-Spec Carpenter 158® steel bolt Shot Peened for Increased Strength per Mil-Spec Tool Steel Extractor Assembly (spring with viton insert, pin, extractor) Mil-Spec Ejector Assembly (ejector, spring, roll pin) Gas Rings – Set of 3 Comes Assembled
