This guide details the process of replacing worn gas rings on an AR-15 bolt carrier group (BCG). It covers diagnosing worn rings using the 'gravity test,' disassembling the BCG, carefully removing old rings with dental picks, installing new rings with staggered gaps for optimal sealing, and reassembling the BCG. The process concludes with a repeat of the gravity test to confirm successful replacement. Instruction is provided by an experienced firearm builder and maintenance instructor.
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