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The guide rod and recoil spring are the parts that return a GLOCK slide to battery after every shot. They are inexpensive, they wear out, and they vary by model and generation more than most owners realize. This guide covers the factory designs, common aftermarket materials, what spring weight means, and how to choose the right assembly for your pistol. What the recoil spring assembly does When a round is fired, the slide moves rearward and compresses the recoil spring. The spring then drives t …