Our lower parts kit helps you to build a custom AR15 from the ground up. Mil-spec dimensions and coating ensure the highest quality and correct component interface. - Includes: - Takedown/pivot Spring - Takedown/pivot detent - Trigger/hammer pin - Takedown pin - Pivot pin - Bolt Catch - Bolt Catch Spring - Bolt Catch buffer - Bolt catch roll pin - Safety Selector - Safety Selector spring - Safety Selector detent - 4-40 Set Screw (for threaded takedown pin detent hole) - Buffer retainer - Buffer retainer spring - Trigger guard - Trigger guard roll pin - A2 pistol grip - Pistol grip screw - Pistol grip lock washer - Trigger spring - Hammer spring - Disconnector spring - Magazine catch body - Magazine catch spring - Magazine catch button - Hammer - Trigger - Disconnector