He won the bronze medal in the Men's 10 m Air Rifle Event at the 2012 Summer Olympics in London with a final score of 701.1 on 30 July 2012.

[14] According to his father, Gagan showed early sparks of his shooting ability when, at the age of two, he shot a balloon with a toy pistol.

[10] Narang won a gold medal in the Afro Asian games, 2003 in Hyderabad on 26 October 2003 in Men's 10m air rifle competition.

[16][17] On 4 November 2008, he broke Austria's Thomas Farnik's record, set in the 2006 World Cup final in Granada, Spain.

Gagan said his win was special because Barack Obama, who won the United States' Presidential election on same day, was a source of inspiration.

He also combined with Abhinav Bindra and Sanjeev Rajput to win the country another silver, in the team event behind champions, China.

[22][23] In August 2010, Narang had publicly expressed his displeasure after being ignored for the prestigious Rajiv Gandhi Khel Ratna award thrice and he threatened to skip the 2010 Commonwealth Games due to lack of motivation.