[G.I. Joel]

I have a cracked mechbox Shell in my KWA M4...What the hell could have broken this badly...I have read a thread about a sector gear shearing, but I wasnt using a Lipo...dont own one.
Just putting this out there as a warning to others maybe their casting procedure is less than great?

Its a tank and still shoots well and snipes well. I broke my hop-up adj. wheel and was to replace it...now I think I have more important things to do.
If anyone had dealings with KWA about warranty/tech problems lemme know.Thanks