This parts kit from KE Arms contains the parts you will need to make your AR-15 stripped lower receiver functional. These are high quality, made in the USA parts. The kit includes safety selector, bolt catch, magazine catch, magazine release button, pistol grip screw, takedown pin, receiver pivot pin, bolt catch plunger, bolt catch roll pin, safety selector detent, trigger guard roll pin, takedown pin detent spring, selector detent spring, bolt catch spring, grip screw lock washer and pistol grip.