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The Glock Recoil Spring Assembly for Gen 4 Glocks uses a dual spring. his assembly comprises two coaxial spring elements.
These elements are assembled together with a smaller, central guiding rod and a larger tube. The assembly is similar to the recoil spring assembly previously used in the sub-compact models of the Glock.
GlockStore Tungsten Guide Rod Assembly For Gen 4 Glock 42
