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what are you trying to do?
the ICS hop up units is VERY consistent. but if you want to use a new hop up rubber, you need to change the tightbore as well(The position of the cut is slightly different on the ICS barrel).
I've worked on a couple ICSs before, one of them being the cansoft smoked body M4. This set up worked great in his
Madbull 6.03mm barrel(363mm)
systema hop up rubber(Must wash with kitchen detergent before use. People ignore this step and wonders why it doesn't produce the accuracy they want)
just those two should be fine
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