Well I have a CA M15A4 Carbine and just as most peole say, the standard hop-up died after a while. I upgraded my gun to 400fps and I bought a systema hop-up for my gun. I installed it and everything works fine except the hop-up doesnt really hop up at all.
I have used my brothers CA mp5a3 and if you set the hop-up all the way, the BBs fly upwards. With mine, they just fly a little further, not as much as my brothers gun does. Is thier anyway I could make the hop-up more sensitive or anythingto fix this?