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If you already replaced your hop up assembly and your problem still persisted, I'd take a look at your upper gearbox and check your o-ring for any deformity and check for air leaks. And chrony your gun to see if the fps loss and pin point whether it is improper air compression or something else.
I had a problem with my ICS m4 before and it was because of a bad air compression in the upper, caused by a messed up o-ring not giving a proper seal.
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