KAK K-SPEC Dual Ejector AR Bolt, 5.56/300BLK, Chrome

The KAK K-SPEC Dual Ejector AR Bolt, 5.56/300BLK, Chrome (brand part no. 303-0505-002) 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 Llc. 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 is finished in chrome for a smooth, corrosion-resistant bolt body.

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 chrome for a smooth, corrosion-resistant surface.

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.

What calibers does this bolt work with? Both 5.56 NATO and .300 Blackout, since the two cartridges share the same case head dimensions.

Buy the KAK K-SPEC Dual Ejector AR Bolt

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