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AR-15 LOWER PARTS BASIC AMBI BUILD KIT "Basic build" lower parts kit, featuring an ambidextrous safety selector, ready to complete your AR-15 lower receiver build. For use with the hammer and trigger of your choice (hammer and trigger not included). Includes Mil-spec magazine release, spring, and button Mil-spec hammer and trigger springs Mil-spec hammer and trigger pins Mil-spec bolt catch, spring, plunger, and roll pin Mil-spec buffer retainer and spring Mil-spec pivot pin, spring, and detent Mil-spec takedown pin, spring, and detent Ambidextrous safety selector assembly, spring, and detent Mil-spec disconnect Mfg: Kak Industry Llc.