Finish your AR15 lower with this comprehensive Mil-Spec Lower Parts Kit. Includes every pin spring detent and component needed for a fully functional lower—minus buffer tube assembly and stock. The phosphate-coated single-stage trigger delivers crisp reliable 5.5–7 lb pull with proven mil-spec geometry. All parts are precision-machined for drop-in compatibility with any Mil-Spec AR15 lower receiver. Single-stage Mil-Spec trigger trigger spring hammer hammer spring disconnector disconnector spring trigger pin hammer pin selector selector detent selector detent spring bolt catch bolt catch plunger bolt catch spring bolt catch roll pin magazine catch magazine catch button magazine catch spring takedown pin pivot pin takedown/pivot detents (2) takedown/pivot detent springs (2) buffer retainer buffer retainer spring trigger guard trigger guard roll pin bolt release roll pin A2-style pistol grip pistol grip screw pistol grip lock washer.