Bearing / Bushing
The bearing / bushing are the parts in which the axes of the gears are retained. Primarily steel, the quality of the manufacturer will be even more important if the replica is upgraded. Each gearbox is designed to receive Bearing / Bushing 6, 7, 8 or 9mm but it is not possible to change the size of the latter without changing the gearbox itself. The difference between these two types of fixation is that one works on the principle of rolling so as to accompany slightly the axis of rotation and therefore, less friction, the Bearing. When to Bushing, these are solid metal fasteners requiring a good lubrication. Bearing and bushing are part of the airsoft internal part range.