dangerspaceThe Geissele Reliability Enhanced Bolt Carrier Group features the proprietary Geissele Stressproof Bolt. This forged bolt is crafted from Carpenter 158+, a material developed in collaboration with Carpenter Steel metallurgists to produce a cleaner alloy with fewer impurities than standard options. The result is a bolt with greater strength and fatigue resistance — offering up to five times the service life of a typical mil-spec bolt. Every bolt undergoes a thorough quality control process, including rigorous inspection, high pressure testing, magnetic particle inspection, and a Nanoweapon coating application.
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