This video provides a detailed technical guide on how to replace the gas key on an AR-15's bolt-carrier group (BCG). Featuring Brownells Gun Tech Caleb Savant, the tutorial covers the removal of the old gas key, cleaning the carrier, preparing the new gas key with a flat seal, and securely installing and staking the new key and screws. It emphasizes using quality parts, proper torque, and specialized tools for a leak-free seal to ensure reliable firearm cycling and prevent malfunctions. The video highlights the importance of checking the gas key for leaks before addressing other potential cycling issues.
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