You can buy.
But we've been investing in sniping for 20 years. We have dedicated institutes for research on ballistics, we make our own ammunition, our own rifles, our own scopes, TI sights, training simulation and climatic measurement taking instruments and computers. We have multiple dedicated schools for theoretical studies and dedicated, purpose built ranges for training. We also send graduates to front lines to conduct COIN ops.
In other words, we've built an entire ecosystem for training DMM, Snipers and Sharp Shooters. India buying a bunch of off the shelf rifles isn't going to cut it.
I've been fortunate to see the field manual used by Pakistan Army for Sniper training. Its over 500 pages and is taught in modules. It covers all aspects and is designed based on entirely indigenous research and information.