I have a DPMS 308 and need to buy a scope for my NV clip on however I'm worried about the front sight on my 308 getting into the way of my NV clip on view. Do I need to mill the front sight off? Is this going to be a problem? It also appears I'll need to get a smaller scope 10" tactical vs a scope that is 13" because of the short hand guard rail? Again .. just worried this front sight is going to interfere with my sight through the NV clip on ..... my clip on is about 6-7" and will fit right in front of the sight.