I have just started playing with a PST 1x4 with my fixed front sight patrol rifle. At 1x you can vaguely see the front post, but it is not a hindrance, at 4x its not really noticeable.
I am really liking this concept. Nearly as fast as my Comp2 but with the benefit of 4x and a crosshair. Should have tried this years ago
Not good pictures, but gives a marginal idea of the front post. Leatherwood CMR4 1-4X. I think these are at 1X and at 4X magnification. Its taken with a phone camera and not perfectly centered, so again not the best pictures, but the post does not get in the way really at 1X and you can't see it at 4X. Burris PEPR mount. Burris TAC30 and Vortex Strike Eagle both looked the same as well with front post sights.