Oh boy ... that HK thing was one big pile of bullshit. I do not know what exactly happend in detail but I am pretty certain it had more to do with grudges and political bulshittery (HK is known for being ... very pecuilar) than any quality with the rifles. I mean it is strange that any other nation which ever used the G36 never had the "issues" the German Bundeswehr reported. So yeah. Forgotten Weapons had a few pretty good videos on the subject :