The tricky forward was involved in all four goals including being fouled for a penalty for 2-1 and then slotting home our third and fourth goals in the second half.
It was Jack’s first start for the Under-21s since the opening weekend against Newcastle in August.
Since then, he’s made five substitute appearances and experienced a loan spell at Aldershot in League Two.
His return against the Gunners coincided with the likes of Jon Obika and Harry Kane going on loan. It was his chance – and he took it.
“It was a great feeling to be back playing and I just wanted to impress, hopefully I did that,” said Jack. “I thought I did well for the penalty and then scored the two goals as well.
“I’ve had substitute appearances here and there but that was my first start in ages and it was certainly in my head to try to get on the scoresheet and do well for the team.
“Most importantly, it was a great team performance and we won the game. There is always the rivalry between the teams and you could see that towards the end when there was a bit of an edge. It was great to get the win.”
The win made it five wins and a draw in six matches as we top the Elite Group in the second phase of the Barclays Under-21 Premier League.
Jack underlined the determination of the squad to maintain that start now the likes of Harry, Jon, Alex Pritchard, Ryan Mason, Andros Townsend and Yago Falque – key players this season for the Under-21s – have departed on loan.
“We’ve got to maintain it,” said Jack. “Those players have left to go on loan and left us on top of the league, we now have to stay there. Hopefully we can do that.”