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M140 is ferrous, M160+ is neo
And you'll need a comm lathe, or just take it to a RC hobbyshop.
The benefit of getting the comm turned and motor tuned is it will invariably draw less amperage than any other lonex A1 motor.
Also, active braking isn't nearly THAT hard on brushes, everything that happens during normal use, happens during AB. Braking the motor is the same kind of force as starting the motor. What it's hard on is electrical, draws more amperage and creates more heat. Your motor is essentially doing two starts for every semi auto shot.
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