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Maybe the plastic parts cracked? Did you change the cylinder head and air nozzle o ring?

It's an Evolution Ghost XS EMR Carbontech ETS II. GC16 and this one cannot switch their gearboxs. And I ask Evolution customer service and they replied SA gearbox will fit. It's an Evolution Ghost XS EMR Carbontech ETS II. GC16 and this one cannot switch their gearboxs. And I ask Evolution customer service and they replied SA gearbox will fit.

Thank you for your answers, guys. I ask the compability because I tried my G&G gearbox on my other m4 and it does not fit. I believe it uses a specna arms like gearbox.

Hello, everyone. I have a GC16 wild hog with ETU in it. I dmr it and it feels heavy now. Now the question is: will the gc16 gearbox fit into a Combat Machine plastic receiver? Or any other brand receiver? Thank you.