Back to being Happy my LGS had a replacement SW sight on hand and the Armor replaced it under Warranty. Not sure if SW got a bad batch of Night Sights or maybe the Shield 45 is too much for them but I'm the 4th customer to have Factory Night Sight issues on Shield 45.
Mine was the 2nd that the front sight stopped glowing one the front sight came out of the dovetail and the 4th one side of the rear sight stopped glowing. I Love the Shield 45 hope this is my one and only issue.