The CMMG .22LR Rehab Kit is the perfect way to spruce up your CMMG 22lr conversion kit. These factory replacement parts will breathe new life into your old 22 training AR and keep you blasting through thousands of rounds of cheap practice ammo. Whether you use your rimfire AR-15 for training for just general plinking, this rehab kit is necessary to keep it running through the many rounds to which rimfires are inherently subjected.Kit Includes:Firing PinFiring Pin SpringFiring Pin Retainer PinExtractorExtractor SpringExtractor PinGuide Tube Roll Pin