Glock OEM Recoil Spring Assembly - G17/G22/G31/G37 Gen 4

Factory Recoil Spring

The recoil spring assembly sits under the barrel and controls how the slide travels back and returns to battery on every shot. Springs are a wear part: after enough rounds they lose tension, which can show up as sluggish cycling, failures to return fully forward, or faster slide-to-frame battering. This is a genuine Glock factory (OEM) unit built to drop straight into a Gen 4 G17, G22, G31, or G37, so you replace a worn spring with the exact part the pistol shipped with.

Features

• Genuine Glock OEM Part — Made by Glock to the same specification as the assembly fitted at the factory, not an aftermarket copy.
• Dual-Spring Design — Two springs of different rates work together on one guide rod to soften the slide's impact and smooth the return to battery.
• Captive Assembly — The springs and guide rod come as one captured unit, so there are no loose parts to manage during reassembly.
• Gen 4 Fitment — Built for the Gen 4 full-size frame used by the G17, G22, G31, and G37.
• Marked 5579-1 — The silver spring carries the 5579-1 identifier, Glock's own part marking for this assembly.
• Factory Part Number 65015 — The Glock catalog number, printed on the packaging for a positive match.
• Tool-Free Install — Drops into the slide during normal field stripping, with no gunsmithing required.
• Restores Correct Timing — A fresh spring brings slide velocity back to spec, which improves reliable cycling and reduces frame wear.

Fit And Service

This assembly fits the Gen 4 versions of the G17 (9x19mm), G22 (.40 S&W), G31 (.357 SIG), and G37 (.45 GAP). Confirm your pistol is Gen 4 before ordering, since the earlier Gen 1 through Gen 3 guns use a different recoil spring assembly. Glock recommends replacing the recoil spring periodically as a maintenance item; many shooters change it on a round-count schedule to keep cycling consistent and to protect the frame over the life of the gun.