There are circular and diamond shaped front sight guards that index with the rear peep sight allowing you to center the front sight a bit more easily. They take a little getting used, but I personally think they are more effective.
Examples include Diamondhead sights and H&K style sights.
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Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul