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A 6.03-6.04mm tightbore + Guarder clear hopup rubber & bucking will more than likely fix issues you may have.
You can mod another hopup to work, but you will be losing the awesome stability of the ICS hopup. That's the issue with a normal AR style hopup. After a while, it needs to be readjusted because it tends to loosen from the vibration of shooting your gun. The ICS will always stay exactly where it's supposed to be.
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