These are the exact same parts used by CMMG for all of their rifles and kits. All CMMG products meet or exceed Mil-Spec standards. Kit Includes: Firing pinFiring pin retaining pinTrigger and hammer pinsExtractor springExtractor pinExtractor spring assemblyExtractorDisconnectorDisconnector springEjectorEjector springCam pinTakedown pinPivot pinTakedown and pivot pin detentsTakedown and pivot pin detent springsSafety detentBolt carrier key screwsHammer springTrigger springBolt gas ringsBolt catch springBolt catch roll pin