This is our gear number three. Our gears are interchangeable with AEG gears. However we do not suggested that, because we have done many test and they break pretty easily due to movement of the gear rail and bolt. Because of this draw back, we have made our own gears with a high quality steal allow (Fe,Cr,Mg), which is found in many car gears. These gears are created to stand up to the shock a lot better compared to other AEG gears.