I've heard about the "wandering zero" for quite some time; the G36 had issues with melting during sustained fire as well.
The US Secret Service(maybe the Capitol police) bought some and promptly ditched them not to long after. That was a few years ago IIRC.
Look up the US Army XM8 trials and why they failed. They were having the same issues. Not surprising as the internals were the same as the G36.
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