XD 4'' 9/40/357 Factory Weight 17 lb.
"Delivers Smooth, Reliable Cycling, Eliminates Spring Bind, High-quality one-piece guide rod and load-rated recoil springs fine-tune slide movement for smoother cycling and reduced frame battering in Springfield XD pistols. Hardened steel guide rod helps prevent spring bind; durable, black finish resists corrosion. Wolff 4‘’ guide rod and recoil springs must be used together. All separate recoil springs and guide rod/spring combinations include a factory power striker spring."