Add my welcome to the Board, Sudesh.
Good to hear that an Indian state has opened to big game hunting.
Der Ami has given a possible way to fix a rail that would be machined to take the appropriate base to your rib. Key is to be sure that the rail allows you to butt the base up against your back sight so the sight serves as a recoil stop.
I had such a rail screwed into the rib of my .350 No. 2 and used a Leupold 2.5X fixed scope (no reflex sights in those days), but had to put both rings on the front lens shaft of the scope.
The Trijicon RMR06 will work more easily than any scope. There may just be enough height in your existing rib behind the back sight to machine it to fit one of the bases that you can buy for an RMR06 rather than have to figure out how to fix a rail to that part of the rib...
Regards, Tim
