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Old October 27, 2012, 12:15 AM   #11
Senior Member
Join Date: November 15, 2007
Location: Outside KC, MO
Posts: 10,128
Because it makes it easier to quickly differentiate it from the white dots on the rear sight.

Same reason some night sights makers offer an option of different color tritium vials for the front sight, than for the vials for the rear.
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