Expensive but it's grown on me - Lasermax Guide Rod Laser Sight for GLOCK Pistols

Wanted one of these ever since hearing about them, what i did not realize is that the light blinks? At first i thought it was lame until i looked through my (red dot) optic, and immediately realized why the protected laser blinks, if like in my case you have a red dot, if it didn't blink, when you looked through your optic you would see two red dots and not know which one is which, so the blinking instantly turned from odd to neccesary. Very well designed just make sure that when you seat the recoil spring that three center positive node detent peice is not touching any other metal part in the slide or else it will trigger on its own without your will or knowledge. Otherwise very easy to install and integrates so well your the only one who will know it's there.