This video details common AR-15 bolt failures, including cracks at the cam pin hole and broken lugs. It highlights how nickel boron and nitrided bolts can fail catastrophically, and that military-spec Carpenter 158 bolts from M16s/M4s are also susceptible to lug breakage. Proper inspection during cleaning, focusing on the cam pin hole and lug sides, is crucial. A warped bolt from a crack can cause firing pin binding, leading to 'click no bang' malfunctions.
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