Problematic - Night Fision Perfect Dot Night Sight Set, Square Rear, S&W

Install was easy, sights were bright and easy to use. After the first range session, however, the front sight was dead. Contacted night fision about it and after weeks of back and forth, they sent a replacement set. Again, glowing brightly before and after installation, this time a certified gunsmith, who installed them EXACTLY as night fision said. First range session with them and the front sight glows less than my 10 year old meprolights. Optics planet was phenomenal, but beware of the night fision lackadaisical customer service. Will go through O.P. again