Cryptic Bolt Repair Kit 7.62x39mm/6.5mm Grendel Dragon's Breath. Specifications for Cryptic 7.62x39mm/6.5mm Grendel Bolt Repair Kit: Manufacturer: Cryptic Fabric/Material: 4140 Billet Tool Steel Carpenter 158 Steel Caliber: 6.5mm Grendel 7.62x39mm Features of Cryptic 6.5 Grendel Type I / 7.62x39 Bolt Repair Kit Cam Pin (Choice of coating) Extractor (Choice of coating) Extractor Pin Extractor Spring w/ Viton Insert O-Ring (Viton Insert not included with .308 WIN / 7.62x51mm / 6.5 Creedmoor) Ejector Ejector Spring Ejector Roll Pin Gas Rings (3) Package Contents: Cryptic 7.62x39mm/6.5mm Grendel Bolt Repair Kit Cryptic CC-RKB-0710: Bolt Repair Kit 7.62x39mm/6.5mm Grendel Dragon's Breath