This comprehensive kit includes everything you need to repair or upgrade your rifles bolt assembly including an extractor extractor spring gas rings firing pin and other essential parts. These parts are made from high-quality materials and are designed to be durable and reliable. They are also easy to install making it easy to get your rifle back up and running in no time. Whether you are a seasoned gunsmith or just starting out Luth-ARs AR Bolt Components Kit is a great choice for anyone looking to maintain or improve the performance of their rifle. Includes: Ejector Ejector Spring Ejector Pin Extractor Extractor Spring Extractor Pin Extractor O-ring 3 Pack Gas Rings Firing Pin Firing Pin Retainer