Why not just drill another hole in the barrel? Similar to the hole for the vent rib?Because the front sight is pinned to the “front nub” with a horizontal pin. First pic above shows the pin.
Additionally, leaving that piece in place gives added protection to the front sight. I was trying to make it as rugged as possible. If I did it the way you asked, how would I attach the front or middle of the sight to the barrel?