A man from Manchester was listed as an official sniper by so-called Islamic State (IS).
The Old Bailey heard how Mohammed Abdallah, 26, from the Moss Side area, travelled to Syria with help from his brother.
Records leaked by a defector of IS allegedly show that Abdallah was a "fighter" specialising in using a dushka - a heavy Russian machine gun.
He is accused of membership of IS, possessing a gun and receiving £2,000 for terrorism purposes.
Mr Abdallah denies terrorism offences.
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