Timber Creek Outdoors ARLPKB Lower Parts Kit Blue Anodized Aluminum for AR-15Includes: 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.