Koby Weaver has pleaded guilty to reckless grievous bodily harm after stomping on an officer's head. Photo: Ronnie Amini/AAP PHOTOS

An unemployed man has admitted to stomping on the face of an off-duty police officer with such extreme force he was knocked unconscious in the middle of a busy road.

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Koby Weaver pleaded guilty to reckless grievous bodily harm in company when he faced Sydney's Downing Centre Local Court on Thursday.

A second charge of assault occasioning actual bodily harm in the company of others was subsequently withdrawn by the prosecution.

The 21-year-old was argui

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