Laser system

Not true, depends on the type of laser. I have an astronomical green laser that has a beam that is visible even with some ambient light
 
Can't help you with a reliable, battle-ready option. However, if you're looking for a cheap, chinese-built option, you may want to look here.
http://www.yourlasers.com/product/mystery-jg-001-20mw-green-laser-sight-with-gun-mount-13136

Seems to be out-of-stock right now. I have a very similar one, mounted it on a 10-22, was lots of fun for plinking. It's pretty close to a daylight-visible pencil beam.
However, I also have a 200mW laser I bought, and that is DEFINITELY daylight-visible, but also can permanently blind someone in an instant.

I have a feeling that you will have trouble finding daylight-visible lasers for exactly that reason, they are extremely dangerous and very easy to mis-use. The dot from my 200mW laser can be easily seen a couple km's away, and without a doubt would still permanently damage vision at that range.
 
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