Nine inch ris help

[Evol]

Howzit all

I am looking to stick a 9'ris on my m4. I have a standard m4 outer barrel. I cant seem to find any pictures of the setup Im looking at so was wondering if it was possible?
I would like to keep the front triangle sight and the 14.5' outer barrel.
Is this possible? Any pictures would be welcome

Thanks in advance