The Geissele Reliability Enhanced Bolt Carrier Group has a Geissele Stressproof Bolt. It is a forged Stressproof Bolt, which is made of Carpenter 158+, a proprietary alloy designed to have a cleaner chemical composition, or fewer impurities, than other alloys. It is a stronger, more fatigue-resistant bolt, designed to last five times longer than a standard mil-spec bolt.
Each bolt is subjected to rigorous quality control standards, including high-pressure testing (HPT) and magnetic particle inspection (MPI), and is finished in a durable Nanoweapon coating.
Key Features
- Includes Geissele Stressproof Bolt
- Forged Carpenter 158+ steel construction
- Cleaner alloy with reduced impurities
- Up to 5x longer service life than mil-spec bolts
- High Pressure Tested (HPT)
- Magnetic Particle Inspected (MPI)
- Nanoweapon® coating technology
- Developed from Picatinny Arsenal (US Army ARDEC) DSL research
- Exclusive to Geissele Automatics
- Superior corrosion, wear, and abrasion resistance
- Applied at low temperature to preserve metallurgy
- Surface hardness equivalent to 82 HRC
- Rejects carbon buildup for easier cleaning
- Operates reliably with reduced lubrication
