I would try the Indian bayo on the Indian rifle before I did any work to make them furrin bayos fit.

 

I found the "boss" on the nose cap of my post independance No1 MkIII was slightly oval in shape and it required a small amount of filing in the muzzle ring of the bayonet to make it fit satisfactory.

I should however make it clear that the bayonet was of Indian origin and I would not attempt to make my hooked quillion Patt 07 Mole fit this particular rifle!

 

Thanks. I'll get an Indian made bayonet and see how that works.

After cleaning off some of the black paint it's a little bit better, but it would still need a hammer to get the bayonet on and off.

 

My 1917-refurb Wilkinson 1907 just snapped onto my new 1964 2A like it was meant to be there. Maybe your lug has a ding in it.