At the risk of causing uncontrolled giggling, I find nail polish works very well, lasts quite a while, is very inexpensive, and readily available. It also comes in colors that, well, go to a nail shop and look! I find a flourescent green catches my eye best in low light. I prop my gun so the front sight is relatively level, and place one generous drop just below the top edge, then let it dry overnight.
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Shoot carefully... swifter...
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