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Chances are whoever you bought the gun from did the metal slide upgrade "on the cheap" and used the stock recoil spring/guide rod.
My 18c did the exact same thing when I tried it with the stock spring/rod after a slide install, but I tossed an enhanced one in and now it chatters like a madman on full auto. The only failure to return to battery that I get is from low gas in the mag.
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