It may depend where you got the G36. The S&T G36 I worked on had a piston that colour, then again most of the China guns of worked on had a piston that looked more or less like that. I know some retailers *cough* TA *cough* are/were selling Ares G36s but are actually shipping out S&T G36s. Check if you have S&T stamped on your gearset.
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