Originally Posted by Mobuck
Cut the sight tower off the current gas block, grind to contour, smooth the edges, and blacken the bare aluminum with a sharpie=15 minutes with a Dremel and a marker.
Front sight block isn't aluminum. Should be forged steel. You can cut it down, and smooth it, and then cold blue or even Rustoleum oven paint it. A rifle without iron sights isn't really worth much, in my personal opinion.