Color of laser aside, you can still track lasers back to the origin. You just need to have something in the air (dust). Green easier to see outside in the sunlight than red.
You have options of guiderods, light/laser combo, and (I don't know if they have, but) Crimson Trace type mounted lasers.
My take on this..........whatever you get, be aware that there is an offset from the laser to the bore. If you try to actually sight in the laser to the point of impact of the round, then there will be points that the laser will not be on target. These points take the majority of the ranges. How does this matter? Well say if you mount a laser/light combo, then inside of your sighted distance the laser will be below the point of impact and with a proper sight picture you don't actually see the laser. Outside of the sighted distance the laser will be high and you do see the laser, but in a stress situation you may think to go with the laser instead of your sights. The larger the bore to laser distance the worse this phenomenon will be.
My suggestion is if you do go with a laser then align the laser parallel to the bore. You will need to be aware of this offset and deal with this in a high stress situation. Due to this I have actually taken lasers off my firearms and mount at most a flashlight.