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Sounds very strange, especially if the other Combat Masters are working OK. The MK VII has a lighter weight slide which cycles faster, but certainly not THAT much faster. It's certainly better to use the factory springs; I've learned that too. I think there might be something else weird about your MK VII, but I sure couldn't say what. Maybe the guys at the new Detonics USA factory could help. I've heard rumor that they're getting close to accepting the older Seattle guns for service. (I've also heard that it's going to be, like, $65.00/hr, plus parts, if an older gun is returned).
Hope this helps, ...Deeton