Pick up about 30-40 KSC glocks/M9/M93R and fire them. With hop set to the lowest, you will notice that a lot of those guns will hop straight up, even on 0.25g BBs.
And for those Glocks, they usually curve to the left.
There is only a small number of guns that will shoot straight, those are the lucky ones.
So yeah if your barrel isn't pushed left, wobbling, or needs cleaning the chances are its just KSC hop up manufacture.
I have tuned many KSCs and I have to say the KSC hops are the cause of the inaccuracies every time. The solution is to spend that money on a gun that has a marui designed variable hop system.
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