I also want this laser on my glock. I heard that the spring goes bad and needs to be replaced fairly often, I've also heard that there is a bushing in it that wears out or something. It steered me away from buying it, but now that I see people saying its reliable... I'm thinking about it again. To the people who own this laser, how many rounds have you shot with it in the gun?
The only problem I had was when I threw a bout a hundred rounds down range, the laser got dirty and made it hard to see which isn't that big of a deal as long
As you clean it after each use. And it may seem a little loose on the barrel but once it's cocked it's ready to go.