Product DescriptionThe KAK Industry K-SPEC AR-15 bolt is a complete assembled bolt designed to enhance ejection reliability and consistency for 5.56 NATO and .300 Blackout direct-impingement rifles. Its K-SPEC dual ejector system uses standard Mil-Spec ejectors and springs (no proprietary parts), with ejector holes centered on the lugs to help maintain bolt strength. Built from 9310 steel and finished in a machine gun hard chrome, this bolt is built for durability and backwards compatibility with standard Mil-Spec bolt carrier group components.Product Highlights K-SPEC dual ejector design for improved ejection reliability and a more consistent ejection pattern Complete assembled bolt only (use with the carrier of your choice) 9310 steel bolt with hard chrome "machine gun" finish for durability and wear resistance Uses Mil-Spec ejectors and springs-no proprietary parts required Backwards compatible with standard Mil-Spec AR-15 bolt carrier group components; designed for direct impingement systemsSpecs Brand: KAK Industry Manufacturer Part Number: 303-0505-002 UPC: 811163035712 Platform/Fit: AR-15 (universal) Cartridge Compatibility: 5.56x45 NATO / .300 AAC Blackout Configuration: Complete assembled bolt only Ejectors: Dual ejector system (Mil-Spec ejectors/springs) Bolt Material: 9310 steel (MPI tested) Finish/Color: Hard chrome (silver) Extractor: 4140 steel, machined, phosphate coated Extractor Pin: S7 tool steel, ground, heat treated Ejectors Material: S7 tool steel, ground, heat treated Approx. Dimensions: 2.800 in (L) x 0.740 in (W) x 0.740 in (H) Approx. Item Weight: 0.088 lb Note: Does not include firing pin, cam pin, or firing pin retaining pinDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.