The Sprinco USA SPRING KIT-STD BUFFER & 4-COIL BOLT EXTRACTOR SPRING is a solid choice for AR-15 style rifles where dependable cycling and consistent extractor performance are essential, delivering the M4 Carbine CS standard spring kit that helps optimize recoil management and bolt velocity for reliable operation. This kit combines a standard buffer system with a robust four-coil bolt extractor spring, designed to enhance extractor grip, reduce slam-fire risk, and promote smooth, predictable chambering across a variety of ammunition types. Built for rifle parts applications focused on recoil control and dependable cycling, it integrates seamlessly into standard receivers and is suitable for rifles that demand steady, repeatable performance under varied firing conditions. The Sprinco USA component works to maintain proper extractor tension while the buffer assembly helps stabilize the bolt carrier group, supporting consistent bolt travel and reduced felt recoil. Ideal for shooters seeking to refresh worn springs, improve extraction reliability, and maintain smooth feeding in their AR platforms, this kit equips your rifle with durable, carefully engineered springs that contribute to overall shooting consistency and long-term component longevity.