The 37-year-old Rajput shot 454.5 to bag the top prize after topping the qualification stage with 1180 points at the Belmont Shooting Centre.
Chain Singh, the other Indian shooter in the fray, finished fifth with 419.1.
In the qualification, Rajput scored 391 in kneeling, 399 in prone and 390 in standing, while Chain Singh, who was placed second, shot 389 398 and 379 for a cumulative score of 1166.
In prone Rajput shot three 100s and a 99.
Canada's Grzegorz Sych clinched the silver medal with 448.4, while Dean Bale of England bagged the bronze with 441.2.
This is first gold medal in CWG and third overall in these Games.
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