This expert guide from Brownells details the critical process of replacing an AR-15 gas key. Instructor Caleb emphasizes meticulous cleaning, precise surface preparation using India stones, and correct installation with Loctite 638 and specific torque values (50-58 inch-pounds) for Grade 8 screws. The final staking procedure ensures long-term reliability by mechanically locking the screws, preventing gas leaks and cycling malfunctions.
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