CMMG Bolt Rehab Kit Features The CMMG Bolt Rehab Kit bundles every small frequently worn component of a .22 LR conversion bolt into one convenient package including the firing pin and its spring the firing pin retainer pin and the guide tube roll pin. Rimfire ammunition is notoriously dirty burning and the small parts inside a .22 LR bolt see a lot of wear from repeated cycling and fouling so having fresh replacements on hand keeps ignition and extraction reliable. Rebuilding the bolt with new components restores consistent primer strikes and dependable case extraction rather than chasing down individual failures one at a time. This kit takes the guesswork out of sourcing the right parts for a CMMG rimfire conversion. The extractor extractor spring and extractor pin round out the kit addressing the parts most likely to wear from the repeated cycling of a high-round-count rimfire training session. Because .22 LR conversions are popular for low-cost practice keeping a rehab kit in the range bag means a worn part never has to end a session early. This kit is intended for CMMG .22 LR conversion kits and dedicated .22 LR bolts built for the AR-15 platform. It is a smart purchase for any owner who shoots their rimfire AR-15 regularly and wants to keep it running like new. CMMG Bolt Rehab Kit Specifications Brand: CMMG Compatible Hosts: AR-15 Includes: Firing Pin Firing Pin Spring Firing Pin Retainer Pin Extractor Extractor Spring Extractor Pin Guide Tube Roll Pin Available At: GrabAGun