The Glock Gen4 dual captured recoil spring assembly is a factory replacement part for the Glock 21 pistol. The recoil spring assembly is constructed of stainless steel with chrome silicon springs. The Gen 4 recoil spring assemblies are designed to withstand 5,000 rounds before they should be replaced to maintain reliability. This assembly will not work with the Gen2 or Gen3.
Fits: Generation 4 (Gen4) Glock 21
Design: Dual Captured Recoil Spring
Material: Stainless Steel, Chrome Silicon Springs
Note: Glock recommends recoil spring replacement at an interval of 5,000 rounds.
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