Originally Posted by kalnaren
Hop-up is necessary. If you don't use it you'll never achieve the full effectiveness of your gun.
By not necessary, I meant that I probably won't need to change anything because it should already be optimized because it is a used gun.
By the way what does the lever looks like? I opened up the panel where the hop-up is and I see two gears. One large and obvious and one small one. I'm guessing I adjust the bigger one but it is pretty stiff and I don't want to break anything.