This guide details the installation and testing of two AR-15 triggers: the Geissele Automatics SD-C and the AT3 Tactical Nickel Boron 2-Stage Trigger. The video demonstrates their mechanisms using a cutaway lower receiver and measures pull weights with a digital gauge. The Geissele SD-C registered 3 lbs 0.0 oz, while the AT3 Tactical measured 4 lbs 11.6 oz. This content is presented with high authority, utilizing specialized tools for objective comparison.
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