Cmmg parts kit, ar15, lower pins and springs.Includes two trigger pins, three trigger springs, bolt release role pin, trigger guard role pin, bolt release detent, two take down pin springs, two take down pin detents, selector lever detent/spring, buffer tuber dentent and spring.All parts meet mi-spec.Finish: BlackType: Spring KitModel: Lower Parts KitSize: AR-15/M16/M4