McCullum, who has started to find some form, smashed Irfan Pathan for successive boundaries while Gambhir hit left-arm spinner Shahbaz Nadeem for two fours and a six in the fourth over of the innings that fetched 16 runs.
In the next Umesh Yadav over, the duo got another 13 runs as the 50 came off in only five overs.
The Daredevils pacers lacked the discipline as they couldn't bowl to one channel which made life much easier for Gambhir-McCullum combination.
Finally Varun Aaron, coming back from stress reaction injury, finally dismissed Gambhir. It was a delivery that climbed up on Gambhir as he tried to play the dab-shot to thirdman only to inside edge onto his stumps.
In Image: Gautam Gambhir of Kolkata Knight Riders plays a shot