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Spring only pushes the lever down after the BB has passed. Which is the same as what the large O-ring does. I have yet to have a spring in my hop up units like that, never saw the point of it. I DID drill a hole just above the lever on my stock CA M24 hop up and put a small set screw into the top of the barrel to hold down the lever in an attempt to make the hop up act more consistantly. Not really sure if it did anything. And was a pain to adjust, had to take the sun shade off my gun to access it.
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