Thanks everyone. I'm much appreciate for clear me out.
By the way, What kind of hop up rubber do you guy recommend beside the prometheus ? Thanks.
I test the G&P hop up rubber and it's really suck, it's more worth than my ICS stock rubber. I'm waiting for Guarder one from airsoftparts, hopefully it will do the job good on the modify one piece hop up to fit on ICS M4.
KND
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