The Geissele Standard Lower Parts Kit provides all internal components necessary to complete or rebuild your lower receiver with mil-spec quality and enhanced safety features.Geissele Standard Lower Parts KitIncludes 18 standard parts for complete assemblyMil-spec quality construction and materialsPosi-Snap safety with positive tactile feedbackImproved safety detent for enhanced performanceNo grip included - internal parts onlyDesigned for firearms enthusiasts and builders who demand reliable high-quality components with superior tactile feedback when engaging safe or fire positions.