Different guns and brands will have different gears and motors and will sound different.
Can't assume that they are perfect when brand new. Some require work to hit that sweet spot so they are pretty quiet and last a long time with less wear.
My m4 was fairly quiet compared to others with a drop in g&p m120 mechbox but after modifying the PTS grip plate to allow for better motor positioning, she's even quieter. Meanwhile I know my mp5 screams and squeals because of the JG motor and the old modify modular gearset.
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