The difference between bushings and bearings | CNC ...
The bearings (or bushings) are installed in the gearbox housings of the airsoft gun and they set the position of the gears. The bearings also serves for lowering of friction torque moment on the axis of the gears. The name of the bearings/bushings version means the diameter under the flange (lower diameter), mostly like 7mm, 8mm and 9mm.
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