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The spring that comes in is too powerful for the the stock gun. They put a powerfull spring (I don't have the grade here, but it makes the gun shoot well 400-415 fps), so the gun can pass customs when it gets imported. People should put the other spring that comes in, which is the spring that normally goes in the gun rpior import) when they receive the gun, and then get a slightly powerfull one if you want to upgrade.
Happened twice to my friends G36KV; twice the piston broke at the same place, like yours. We thought it was the blow back system for the first time. We then changed the spring with a lower one at the second fail, a M120 if i recall, so the gun shoots about 380-90 fps and it's just fine. Never broke since then.
My two cents advice here.
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