CMMG Lower Spring and Pin Kit provides all of the essential pin and springs needed to complete an AR-15 Lower Receiver. This kit is convenient for putting together a new rifle, rejuvenating an older gun or just keeping on hand for future AR-15 repairs.Kit Includes: Trigger springHammer spring2 Hammer/trigger pins2 Takedown Pin and Pivot Pin detent springs2 Takedown Pin and Pivot Pin detentsDisconnector springSafety selector detentSafety selector springBolt catch springBolt catch plungerBuffer retainer springBuffer retainerTakedown detentTrigger Guard Roll PinBolt Catch Roll Pin