EB0040 Armalite AR15 Bolt Assy.

Armalite AR15 Complete Bolt Assembly (EB0040) is a factory OEM replacement part that is constructed from 158 Carpenter steel. All Armalite M-15™ bolts are heat-treated; shot-peened, grip blast finished, and have a manganese phosphate finish per 5.3.1.2.MIL-STD-171.