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Old January 4, 2013, 10:39 AM   #4
Strafer Gott
Senior Member
 
Join Date: May 12, 2011
Location: New Mexico
Posts: 1,315
It keeps the front sight uniformly illuminated. If the sun shines on one side or the other, your shot placement may be affected. For some reason this really aggravates my astigmatism.
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