Get what you pay for - NCSTAR Green/Red Laser Sight with Rail Mount

On both units either the green laser or the red laser became loose after mounting and "shimmied" when focused on the target. No adjustment remedied the problem. Cheap price equals cheap product.
The laser bulb was loose in the unit, the red in one the green in the other.

The concept is good as 3 personnel can use the unit on shotguns, one using red laser, one using green, and the third using both so each can tell which is his laser/point of aim. Too bad there is not a similar product available in better quality.