I don’t think that is a boy and that is not a toy gun.
That is a serious man in his late 20’s or early 30’s and I get that he means exactly what he said.
Look at his feet. Look at his forearm that you can see.... not a child. Look again at his face. There is life lived there.
I’m just going by what the photographer said.
http://www.huffingtonpost.com/burma-journal/buddhist-monk-wirathu-lea_b_3481807.html
A picture of the real Ashin Mirathu
Pictures of Ashin Wirathu, none with gun
The photo merely goes well with the [true] quote. As an aside, the holding of the gun with finger off trigger seems more to speak of it being real...