The discussion on bolt carrier groups (BCGs) for AR-15 platforms highlights that while lightweight BCGs can slightly reduce recoil, they may come at the cost of reliability. Heavier BCGs are generally preferred for better reliability, especially with 5.56 NATO. Specialized BCGs like the Gemtech adjustable model are designed for suppressor use and allow for gas setting modification. Ultimately, the quality of the bolt itself is more critical than the BCG type for overall reliability.
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