Do not buy if you looking at mounting it on your ar15 or carbine conversion - VISM Micro Greendot Laser Sight w/ Integrated Red Laser VDGRLB

I bought two VISM Micro VDGRLB .The first one was mounted on my 9mm Carbine Conversion . After 100 rounds the unit came apart . I took it back and they replaced it with a new unit . After 120 rounds the red / green dot knob came loose and the unit was stuck in laser on the hole time . They gave me the Nikko Stirling Diamond M70 now as the replacement . The second one I mounted on my AR15 223 . After one day at the shooting range the unit also came apart . I took the unit back and it was also replaced by a new unit . One week later at the shooting range and the unit came apart again . I would not mount this VISM VDGRLB on anything except maybe a paint ball gun .