The tie will be broadcast on BBC One on Saturday 5 November, with a midday kick-off.
Shields will welcome to the 1st Cloud Arena a Forest Green side which currently sits 21st in League One.
Kevin Phillips’ side booked their place in the first round proper with a 1-0 victory over National League Scunthorpe United.
The Mariners’ FA Cup fixture is one of five that will be broadcast from Friday 4 November until Monday 7 November.
Photo credit: Darren Murphy
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