LaserMax Uni-Max Green Rail Mount

I mounted this to my M&P 9mm and it fit very tightly to the weaver rail. It is made out of plastic...sort of in the same way the M&P, glock or other polymer framed guns are. The plastic is very strong but if you go gorilla on the screws you can break it. The switch is easily accessible and ambidextrous. Some have mentioned concerns about inadvertently turning the laser on when holstering the gun but I think there will be equal pressure on both switches reducing that risk. It also has an automatic shut off if it is left on for more than 10 minutes. The green laser is very bright even in daylight...easily visible to 35-40 yards on bright days. I sighted this in using the included tool. One downside to this laser is the windage and elevation adjustment. It clearly warns on the package not to turn the adjustment screws more than X number of turns. However, now that I have set the windage and elevation there is no way to know how much i can turn the screws if I place this on another gun. That being said it was easy to sight in and has not moved in spite of shoot about 300 rounds. One other thing I should mention is that with very small adjustments of the windage and elevation screws resulted massive movements in laser beam travel. A big advantage of this laser is it will come in handy for home defense especially at night. As you might imagine, most perpetrators will not hang around long with a laser sighted in on their chest. If the perpetrator is not skeerd of lasers you can easily see where you are aiming even if you can't see your iron sights and dispatch the perp. Another advantage, at least for me, with this laser is that I have found that I am able to be more consistently accurate with my shooting especially at longer distances. Target acquisition was faster and I was able to shoot with both eyes open...something I have never mastered using iron sights (stupid dominant left eye!) One other downside I have noticed and shouldn't come as any surprise is that there is soot build-up over the lens of the laser. The lens is easily cleaned but I did notice over the course of 300 rounds that the intensity of the laser did decrease due to the soot. I was shooting Blazer brass rounds which seem to shoot reasonably clean for cheap ammunition so I imagine that this will be a problem that will arise with anyone when they shoot enough in one shooting session. In the end I am very happy with this purchase in spite of the expense. It has given me significant improvements in my shooting accuracy and home defense.