Bolt Carrier Group
Don’t Buy a Nitride Bolt
Nitride looks good on paper, but AR bolts are a poor place to use a high-temperature ferritic nitrocarburizing process. This article explains how nitriding can over-temper the bolt after heat treatment, reducing core strength and fatigue life in the area that matters most: the cam pin hole and bolt lugs.
Read GuideDon’t Buy an S7 Bolt
S7 is tough, but it is the wrong kind of tough for an AR bolt. This article explains why through-hardened tool steel lacks the hard case, ductile core, and surface fatigue resistance that case-hardened Carpenter 158 and 9310 bolts rely on for long-term cyclic durability.
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