a shim is something to take up some slack, for example the bushings or bearings in your gear box, you shim them so that they do not have excessive movement side to side. shim too tight things do not move too well, shim too loose and things tend to be sloppy, and wear out quicker, from what I hear the JG guns, come with plastic bushings, And are shimmed poorly. by the way how is your JG gun holding up? I have been thinking about getting one.
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