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

Here is what I think,

1)laser sights are a tool, most every shooter I have seen shots better in bad conditions with a laser.

2) Far as you need with a pistol

3) both the same but green will cost close to double what a red one will.

4) Crimson Trace

5) Not really but might not fit the same holster.

6) the SW is an easy install and the PT92 is to with grip laser.