Traduzione in corso passo 20
first pictures shows all the terms for internals to help with future steps. Note Some parts will look a little different.
Now remove the gears without removing the little washers (or shims as there called in the airsoft industry). Check to see if there are shims left on the bearings and put them back on the gear it came off of.
Shimming or the practice of placing shims on each gear can a complicated and tedious process recommend for those with previous airsoft technical experience. G&G AEG Shimming Guide Airsoft guide is avalable if would like to learn this process.