How did nagato obtain the rinnegan??? I thought it was an uchiha thing.

[Aikor]

Le question.

It was explained in Konan vs Obito fight

 

[SkyGodHorus]

Thanks for the reply

But actually my question is how Madara inserted his rinnegan into Nagato eyes

Is Nagato not aware of it or what really happen to Nagato normal eye?

I don't know man. Use your imagination. Madara obviously did it when Nagato was a kid without him knowing it, just as he put the curse seal in Obito without him knowing it and just as Obito brainwashed Yagura without him knowing it. He probably did it when Nagato was too young to remember.