My hunting buddy has an AR in 7.62 and he uses it exclusively for deer hunting.
It's a flat top with the front sight and the sight is visible through the scope.

Is there any harm in clipping the front sight off with a hack saw?

I'm not an AR guy so I'm not eager for a gas block project and I know his vision needs all the help it can get.

"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen