re: Laser Sights for S&W M&P 9MM Shield & Taurus PT92?

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3) Is red or green better?

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Green is better for visibility, worse for battery life. The visibility thing isn’t an issue indoors or at night, but outside in sunlight it makes a difference. Regardless of color don’t expect to pick up the dot in daylight like you do when indoors or at night; there’s a pretty big difference.