This top quality complete spring set for a full-size, 51911 contains every spring needed to complete or upgrade your pistol. These heat treated music wire springs are the finest quality coil springs on the market and will provide you with exceptional service. Extra Power recoil springs are rated for standard velocity and high-velocity loads and a reduced power hammer spring improves your trigger pull and reduces the force required to cycle the slide. Included is a spring, recoil, govt., extra power firing pin spring, reduced power hammer spring, mag catch spring, sear spring, and a plunger tube spring.