The KAK K-SPEC Enhanced Dual Ejector Bolt, 5.56/300BLK, Phosphate (brand part no. 303-0502-011) is a bolt built for the AR-15 platform and chambered to run both 5.56 NATO and .300 Blackout, since the two cartridges share the same case head dimensions. KAK Industry built the K-SPEC dual ejector system around mil-spec ejectors and springs, meaning it uses no proprietary parts that would complicate future maintenance. The ejector holes are centered on the bolt’s locking lugs specifically to avoid reducing the bolt’s strength, a detail that matters on a part that sees repeated high-pressure cycling. That dual ejector setup increases ejection reliability and adds consistency to the ejection pattern compared to a standard single-ejector bolt. This version carries a traditional phosphate finish, a proven, corrosion-resistant coating widely used on mil-spec bolts.

Key Specifications

• Chambered for 5.56 NATO and .300 Blackout, since both cartridges share the same case head.
• Uses a dual ejector system built around mil-spec ejectors and springs, with no proprietary parts.
• Positions ejector holes centered on the locking lugs to avoid reducing bolt strength.
• Delivers more consistent ejection reliability than a standard single-ejector bolt.
• Finished in phosphate, a proven, corrosion-resistant mil-spec coating.

Frequently Asked Questions

What does the dual ejector system do? It uses mil-spec ejectors and springs to increase ejection reliability and add consistency to the ejection pattern compared to a standard bolt.

How does the phosphate finish compare to chrome? Phosphate is the traditional mil-spec finish, offering proven corrosion resistance at a lower cost than a chrome-finished bolt.

Buy the KAK K-SPEC Enhanced Dual Ejector Bolt

Get more consistent ejection out of a 5.56/300 Blackout AR-15 build with a proven phosphate-finished dual ejector bolt. Browse Schaefer Defense’s AR-15 bolts selection and order from our Lubbock, Texas gun shop for fast shipping.