Black Rain''s Lower Parts Kit includes a buffer retainer and spring, trigger gruad and roll pin, selector, bolt catch spring/retainer/catch/and roll pin, mag catch and spring, mag button, two (2) of each take down pivot pin springs and detents, pivot pin, Mil-Spec disconnector, Mil-Spec trigger and spring, grip screw, star washer, selector spring and detent, two (2) trigger and hammer pins, take down pin, disconnector spring, hammer spring, and Mil-Spec hammer.