It sounds to me like it's overhopped, with the hop up not aligned with the center point of the gun, rotated slightly to the right, especially if it's a smooth even curve equally up and to the right. If the curve up looks like it's different from the curve right, then it would be two separate issues, but if from the firing position it looks like it's an even parabolic curve upwards that has just been rotated slightly clockwise, then it's the hop up orientation that is the problem. Out of the box my well l96 had that problem, I just rotated the hop up unit counter clockwise inside the barrel and now it's pretty straight.
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