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. With this kit, youll have everything you need to keep your rifle running smoothly and accurately, no matter what the situation.Features :Replacement for .223 Remington/5.56x45mm NATO AR-15 Pattern BoltBT-06 EjectorLR-26 Ejector SpringBT-04 Ejector PinBT-07 ExtractorBT-08 Extractor SpringBT-03 Extractor PinBT-08-OR Extractor O-ringBT-01-3P 3 Pack Gas Rings