512 daddy
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New cz 512 bought 2017 first 100 rounds no probs then jams mag spring not lifting the noise up enough.turn spring over feed is smoother.bought new mag .spring installed incorrectly turned spring over so it lifts the noise of bullet.two drops rem tefflon in mag slide. I was all apprehensive about the first one going in ruff , now supper smooth. Hope this helps.