Geissele Stressproof Bolt Assembly

The Stressproof bolt is the same bolt Geissele puts in its Reliability Enhanced bolt carrier group. It is forged from a cleaner grade of bolt steel that Geissele developed with Carpenter's metallurgists, with fewer impurities than the standard material.

Geissele rates it at five times the service life of a mil-spec bolt. Every one is high pressure tested and magnetic particle inspected, then finished with the company's Nanoweapon coating. The extractor comes installed, so this is a straight swap for a tired bolt rather than a parts kit to build up.