The KAK K-SPEC AR Bolt 5.56/300 Blackout is engineered with a dual ejector system that utilizes Mil-Spec ejectors and springs, ensuring no proprietary parts are needed. This complete assembled bolt features ejector holes centered on the lugs to maintain the strength of the bolt while enhancing ejection reliability and consistency in ejection patterns. Constructed from durable 9310 steel and finished with a phosphate coating, this bolt is backwards compatible with all standard Mil-Spec bolt carrier group components, making it suitable for any AR-15 style direct impingement system. Perfect for both tactical applications and competition use, the K-SPEC bolt is a reliable choice for your next AR-15 build.