Another lesson in AirsoftTech 101 from RetroArms for budding airsoft gunsmiths --- the bushings and bearings in AEGs... "Since you frequently ask questions about the types and dimensions of our bushings/bearings, we had to write down some basic informations. 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.