1940 Dispersal, bad pitting, would it have been released like that?

[Alan de Enfield]

I'd suggest that the pitting and the black paint are both since it left service and occcurred in civilian hands'

Is it by any chance an RTI rifle ?

And now seeing that it is sporterised, I doubt it is an RTI. Just 'ridden hard and put away wet' and then painted over.