The 32-year-old Narang has 971 points to his credit while China's Shengbo Zhao is placed second with 896 points.
Pistol King Jitu Rai was placed number two in men's 50m pistol with 1929 points, behind Jongoh Jin of Korea.
Beijing Olympic gold medallist Abhinav Bindra, who is also through to Rio, was ranked fifth in 10m air rifle followed by Narang in seventh position. Gurpreet Singh was positioned fifth in 25m rapid fire pistol.
Multiple time World Cup winners Narang had won a bronze medal at the London Olympics in 2012.
Troubled by injuries and his form taking a dip, Narang, was, in the beginning of the season, left out of the Indian contingent for the first three World Cups by the National Rifle Association of India in the 10m air rifle category after he failed to record the minimum qualification scored required.