Description Recoil Guide Rod & Spring Combination – Factory Standard – 16# Recoil and guide rod combinations offer a recoil spring and a Wolff guide rod together at a savings over individual prices. Note: Wolff guide rod and recoil spring combinations are non-captive. Note: SKU’s 500xx, 501xx and 502xx are NOT for use in Generation 4 & 5 models. For Use In: Glock 26, 27, 33 Only