This comprehensive guide details the installation, gauging, fitting, and tuning of three different AR-15 fire control groups: Geissele SSA-E, LaRue MBT, and a factory trigger. It emphasizes meticulous inspection of all components, proper tool usage (especially brass punches), and thorough fitment checks of pins, bores, and moving parts. The video also covers common pitfalls, troubleshooting binding issues, and performing essential function checks to ensure reliable operation.
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