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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.
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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.