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OK. I was thinking that perhaps if you had the stock spring with the heavier metal slide that it was perhaps taking up more gas cycling the slide back with not enough eough spring resistance (if that could even happen).
I would suggest maybe you should try to reinstall the stock parts and see if the gun does fire that way. That would confirm or eliminate that the problem is with the lower part of the gun (mag, hammer, etc) or the upper (problem with the upgrade parts, an error in assembly, etc...)
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