The AB ARMS AR-15 Small Parts Kit by American Built Arms Company is a must-have for any AR-15 enthusiast. This comprehensive kit includes essential components such as a firing pin retaining pin, ejector, ejector spring, ejector pin, extractor spring with insert, extractor axle, three gas rings, and a donut ‘O’ ring. Designed for reliable performance and durability, this small parts kit ensures your AR-15 operates smoothly. Perfect for upgrades or repairs, it’s an essential addition to your firearm maintenance toolkit.