Night sights will still allow you to get a sight picture in low light/night, and I don't really see a negative in using them. The downsides to lasers is they are electronic so they can fail, and some people become so used to them that they forget to practice good shooting fundamentals.
I think night sights are definitely good and can only increase your capabilities. Lasers can be good as long as you use it to add to your solid shooting skills.
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