I filed in the dovetail for my front sight post today. I measured the thickness of the brass on the sight at around .055 inch, and the depth of the dovetail is just under that. I didn't want it to be too deep so erred on the side of caution. When installed there is a slight gap at the back of the sight where it does not touch the barrel. It's not excessive but its there. Is a slight gap in this manner ok, or should the sight be touching the barrel? At this point Im going to live with it, but was just curious.