Revitalize your AR-15 rifle system with our advanced bolt upgrade and rebuild kit, inspired by the renowned SOPMOD design. This comprehensive package is meticulously crafted to rejuvenate your bolt assembly, ensuring optimal performance and reliability. Recognized as the core component of your AR-15, the bolt assembly demands regular maintenance to withstand the most challenging environments. Trusted by professionals, our kit provides the essential spare parts needed to maintain the seamless operation of your AR-15, M16 or M4, even in the field. Equip yourself with this indispensable kit and experience unparalleled durability and efficiency in every mission. The kit comprises an extractor manufactured to USGI specifications (shot peened), an extractor pin, a BCM extractor spring (constructed from chrome silicon, heat-treated, stress relieved and shot peened), three USGI gas rings, a CRANE O-ring (mil-spec) and a black extractor insert