Hello Gentlemen, I am new to this forum. I am a semi retired gunsmith(if there is such a thing)and have been around weapons for a long time. Vietnam warhorse vintage. Haven't hunted much in a long time. So many new things out there. A friend lent me a Laser Genetics nd3-40 sub zero laser designator. Mounted it on a rifle and have been playing with it some. Interesting. Was wondering if anyone has some comments about them. Usablity and how they hold up under use, ect. Cheers, Ottway