Goals from Scott Twine, Peter Kioso, Troy Parrott and Max Watters handed Dons the victory over the 10-men, following Stuart O'Keefe's first half red card.
Here's how we rated the players.
1. Andrew Fisher - 7.5
Two great saves helped keep Dons in the game when Gillingham had a rare sight of goal. Put his body on the line for the second in particular, and once again had great command of his area
2. Dean Lewington - 7.5
Barely gave anything up to Gillingham's front line in another assured outing for the skipper
3. Harry Darling - 8
Took a blow to the face early on, but it only seemed to make him more determined to silence Oliver, who barely got a sniff after that
4. Warren O'Hora - 7-5
Another solid outing, barely giving anything away for Gillingham to exploit