I like the 40-9 conversion for training but I wouldn't carry it for serious business. If that's the choice then definitely change the extractor and ejector to 9mm. I still think it's adding a variable that is easily avoided with just getting a 9.
The 357 conversion is easy because it only requires a barrel. My 357 conversions have been 100% reliable. My 40-9 conversion has been mostly reliable, I only use it for training.
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