This video provides a detailed, multi-chapter guide to installing, gauging, fitting, and tuning three different AR-15 fire control groups (FCGs): the Geissele SSA-E, LaRue MBT, and a factory type. It covers essential steps like spring inspection, pin removal and inspection, de-magnetizing, de-greasing, and precise gauging of FCG components and lower receiver bores. The video also touches upon receiver bore lapping, selector bore gauging, and pistol grip installation issues. While focusing on FCGs, it explicitly states it does not cover anti-rotation pins, lightened hammer springs, or cassette triggers. The content is highly technical and geared towards AR-15 builders and enthusiasts seeking to understand and optimize their trigger systems.
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