Installed a set of HTACs on my 75B, and there's so little room left under the rear sight that I have to shift it to a certain angle to see light through it. It's definitely not touching anything, but I'm wondering if I should adjust the fit a little more.
Edit: when I say it's tight, I mean it's TIGHT, like I can't manage to get a piece of printer paper under it, but I can see light.