The CMMG AR-15 Survival Kit contains all the parts that should be kept on-hand, in case of a much needed repair. A great kit to keep in your range bag, or keep with your gear. Kit contains the following parts: Ejector, ejector/selector spring (2), extractor, extractor spring and buffer, extractor pin, ejector roll pin, receiver takedown pin, disconnector, gas ring (3), cam pin, carrier key screw (2), firing pin, firing pin retaining pin, receiver pivot pin, takedown/pivot pin detent (2), disconnector spring, hammer spring, trigger spring, hammer/trigger pin (2), selector detent and takedown/pivot pin detent spring (2). Mfg: Cmmg SPECS: Fits AR-15 rifles.