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.

The name of the bearings/bushings version means the diameter under the flange (lower diameter), mostly like 7mm, 8mm and 9mm. Some older airsoft replicas, for example from Tokyo Marui had even 6mm bearings/bushings. The diameter of the bushings or bearings must be the same as the diameter of gearbox housings, this infomation is wrote in the bracket. If you choose gearbox (8mm), it means, that the housings have diameter of the 8mm. It does not mean any version of strength or type."

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