Avoid! fails frequently and wastes batteries. don't depend on this in a pinch! - Lasermax Guide Rod Red Laser Sight for Glock42

I bought one of these for my G42 and another for my G43. I liked the internal design as it works well with my concealment holsters. Uses a sliding Slide Lock to engage. Too easily engaged! Unfortunately, it will randomly engage in a pocket, glove box or holster and drain the batteries. After 3 or 4 shots the guide rotates and the laser stops working. Great concept. Poor product design. Avoid!!!!! Would have returned, but waited too late. I would hate to think my life depended on these. They are both equally bad. Don't depend on this to save your life!