The current world record holder and former world number one, Heena shot 199.4 in the eight-women finals to finish ahead of Chinese Taipei's Tien Chia Chen (198.1) and Gim Yun Mi (177.9) of Korea at the Dr. Karni Singh Shooting Range.
Heena shot an impressive 10.3 in the second last shot of the finals to extend her lead to 1.5 points over her rival from Chinese Taipei. The Indian shot exactly 10 in her final attempt and it was enough to get her the top prize, despite a 10.2 from Tien Chia Chen.
However, it was a bad day at the office for the host country in men's 50-m rifle prone and women's trap as none of the Indian participants could clear the qualification hurdle.
In men's rifle prone event, young Swapnil Kusale finished 14th after aggregating 617.2 over a series of six shots. Sushil Ghale was 17th, while Surendra Singh Rathod was 24th in the pecking order.
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In women's trap, where only one quota for Rio Games was on offer, Shreyashi Singh lost out in the shoot-off.
After stage 1 of men's 25-m rapid fire pistol, London Olympics silver medallist Vijay Kumar was placed seventh with a score of 285 including seven Xs. The other two Indian participants in the event, Neeraj Kumar and Harpreet Singh, were placed 13th and 16th, respectively.
Prior to this tournament, the 26-year-old Patiala-born girl clinched a gold medal each in the Asian Air Gun Championships and Asian Shooting Championships in Kuwait last September and November, respectively.