Power issues - Truglo Tru Point Green Laser/Light Combo

Constantly had to reseat the battery cover to get the light/laser to come on. Not good on a self-defense weapon. Purchased the Surefire X300 flashlight and Crimson Trace CMR-206 green dot laser instead. More than twice as much as the Truglo but this combo has NEVER failed on my other firearms. This would be OK on something that was just for target shooting but then you wouldn't need the flashlight.