Glock Rear Site Laser..never seen this before, but looked interesting.
at these somewhere else,looks like a good idea,they said the sights won't interfere with your existing holster
but after thinking about it, I rejected it for two reasons:
1) It is going to take a beating on every slide-recoil cycle, and possibly malfunction after little usage.
2) The design does not, at present, permit instant on/off, which is a critical tactical feature.
I tend to side with LLE's resoning! I think I'd just stick with Crimson Trace, thier system for the Glock is great!
I'd mount it on my 19C with a happy plate or 21C with the happy plate and we'll see how it handles some FA fire.