The Black Rain Ordnance 13-Piece Spring Kit provides essential replacement springs for your AR-15 build or maintenance. This comprehensive kit includes one of each of the following springs: Trigger Spring, Hammer Spring, Forward Assist Spring, Magazine Release Spring, Charging Handle Latch Spring, Bolt Extractor Spring, Disconnector Spring, Bolt Release Spring, Selector Spring, Buffer Retainer Spring, Takedown Detent Spring, Pivot Pin Detent Spring and Ejection Port Cover Spring. This kit ensures you have the necessary components for smooth operation and reliable performance.