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Sound can change when you replace internal parts. Plus you haven't done any upgrades to the gears according to your post.
You are running PDI 120 spring which is a little bit higher than stock so your mechbox should be fine. If your gun already went through around 400 shots and didn't stop working it should be fine.
Also, getting a set of metal bushings and shims might be a good idea. Stock bushings should work fine with soft spring but if you want to be on the safe side, get a set of metal ones.
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