Includes: tc ambidextrous safety selector, tc ar takedown pins, tc magazine release button, mounting hardware included.(mil-spec bolt catch, springs, and pins are required to complete build) the timber creek ar-15 lower parts kit provides quality parts needed to start any msr build.These high-quality parts are cnc machined from aircraft-grade billet aluminum.Model: Lower Parts KitMaterial: AluminumHand: Ambidextrous