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The original 520 did have a recoil operated action lock controlled by an "inertia bar" that rode in a groove milled in the left side of the trigger guard. It was soon replaced by the curved wire spring used by all subsequent models to unlock the action lock. You probably won't see this in any of the schematics. I used to have one with a missing bar that I milled out the triggerr guard to accept the more modern part and restored the function. Here endeth the lesson. Goatwhiskers the Elder
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