Don't do it - Laserlyte Springfield XD + XDM Rear Sight Laser Sight

Everything is good until you start using the gun. Then it changes modes, pulse to straight, straight to off, etc. Not useful in my opinion. I sent it back to laserlyte, they sent me another, same behaviour. Look online, I am not the only one experiencing this. Maybe it works on a 22, but not my 40. Recoil seems to be just to much for it.
Pros: Good concept and easy to install, doesn't prevent you from still using sights
Cons: doesn't work reliably.

This review was written in the old system and had content requirements that are different than reviews written today.