Lasermax dissassembly switch. - LaserMax Gen. 4 Guide Rod Red Laser Sight for Glocks

I have a Glock Gen4 Model 19 that I would have to consider being equipped with the LaserMax Guide Rod GREEN Laser. I'm concerned that the Laser system comes with the Slide Release switch. Is this switch plastic or metal and will it hold up? I have a LaserMax Red Laser Guide Rod setup for my Beretta 92FS which I have yet to fire. I'm having to consider obtaining the Green Laser Max Guide Rod for my Beretta 92FS and hopefully LaserMax will come out with a Green Laser Guide Rod setup for a Beretta 92FS Compact. It is indeed interesting that LaserMax can provide the Guide Rod Laser with Green Laser for the Glock Gen3 model 19 but not for the Glock Gen4 Model 19. I'm wanting to pull the trigger on a LaserMax Guide Rod Laser for my Glock Gen4 Model 19 but it does appear that their just might be too many reviews commenting on problems with the Lasermax Guide Rod system. Hopefully LaserMax has improved the system dealing with the malfunctions that are noted in reviews.