Glock OEM Recoil Spring Assembly - G20/G21 Gen 3

Glock G20/G21 Recoil Spring

This is the factory recoil spring assembly for the full-size Glock 20 and Glock 21. The recoil spring is the coiled unit that sits under the barrel and controls how the slide travels back and returns to battery after each shot. It wears over time, so replacing it with a fresh OEM assembly restores reliable cycling and correct slide timing on a high-round-count pistol.

Features

• OEM Factory Original — Made by Glock in Austria, not a reproduction, so it matches the fit and spring rate your pistol was built around.
• Fits G20 And G21 — Drops into the Glock 20 and Glock 21, covering the 10mm Auto and .45 ACP full-size frames.
• Gen 1 Through Gen 3 — Compatible with first through third generation pistols, including the SF (short frame) and C (compensated) variants.
• 17-Pound Spring Weight — Matches the factory recoil rate for standard-pressure loads in these calibers.
• Captured Assembly — The spring is held on its guide rod as one unit, so it installs and removes without separate parts to manage.
• 5600 Designation — The assembly carries Glock's 5600 part marking stamped on the end cap.
• Steel And Polymer Build — Steel spring on a polymer guide rod, the same materials the pistol ships with from the factory.
• Direct Replacement — A worn or sacked-out spring causes short-stroking and brass that ejects weakly; a fresh one returns the slide to spec.

Fit And Service

This assembly fits the Glock 20, 20SF, 21, and 21SF, and works with the standard and C-model compact versions across the first three generations. Recoil springs are a wear item that most shooters replace periodically as part of routine maintenance. Keeping a spare on hand means you are not sidelined when the original softens. Confirm your pistol is a Gen 1 through Gen 3 before ordering, since later-generation models use a different assembly.