How they dis estimation is very simple. They check how many murder has taken place with bullet injury. Their source was all Indian news paper. This figure was counter checked with government statistics whenever it exceeded 5 % of news paper figure.
I think If real figure comes out India will be first and not America. At least in Us people have licencesed Fire arms. In India I believe 95% is illegal Chineese made revolvers smuggled through Bangladesh.
