This video provides an in-depth physical inspection and testing of five Knight's Armament Company (KAC) bolt carrier groups (BCGs) and one Lewis Machine & Tool (LMT) Enhanced Bolt. The instructor meticulously gauges various dimensions, checks for wear, and assesses the internal finishes of the carriers. The process includes replacing carrier keys and screws, performing torque tests, and highlighting the unique features of the LMT Enhanced Bolt, offering valuable insights for AR-15 owners and gunsmiths.
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