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Having a well shimmed and lubricated gearbox will make it quiter. To find out about making it quieter, do some research, there are tons of threads on it.
Just basic tools: screwdrivers, allen keys, magnitizer etc... I use ICS Gear Grease, but I don't think it matters a whole lot.
No, they are not pre- shimmed.
Kind of shims don't really matter.
It's decent quality compared to others.
Can't tell you exactly what's metal in it. Could you post a link of the gun?
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