Mittal shot 71 in the six-man final to finish at the top of the podium.
With scores of Sangram Dahiya (43) and Mohammad Asab (34) added to Mittal's final total, India managed to bag the top prize in the team event too.
In the individual event, Dahiya finished fourth, while Asab had to be contend with the fifth position.
Mittal, a World Cup gold medallist, shot 137 in the qualification and was behind topper Dahiya (140) as well as Asab (138).
UAE's Khaled Alkaabi (70) won the silver in men's double trap event, while Saif Alshamsy (53) finished with the bronze.
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