An AR-10 builder lower parts kit gives you everything you need to complete an AR-10 lower receiver. Each kit includes a trigger, hammer, disconnector, trigger and hammer pins, selector switch, magazine catch, bolt catch, buffer retainer, takedown pins, and all necessary springs. These parts fit AR-10 lower receivers chambered in .308 Winchester or 7.62×51 NATO. Choose an AR-10 builder lower parts kit at Daytona Tactical to complete your custom AR-10 build with quality, reliable components.