How to choose the right Systema gearbox for you?
The easiest way to upgrade your AEG is not to open up the gearbox in the first place, but to replace it with a completely tuned model with the best parts already installed. This route also has the benefit of being able to reverse easily, and you will have a stock gearbox handy for a retrofit, in case you need an even lower velocity for CQB. But how do you choose which one is the right for you in terms of output energy, and what else should you consider when choosing a ready-made gearbox? General principles No matter what series your AEG is and regardless of the desired power level, the barrel length and cylinder type should be matched for optimum performance. That is why, for example, the MC-51 and other G3s have their specific gearboxes. If you are planning to extend the inner barrel of your MC-51, then you should choose a gearbox made for the G3. Then again if you’re chopping a full length G3 down to a carbine, an MC-51 gearbox is the better choice. Remember that the cylinder tube ca
