Depend on trijicon - Trijicon ACOG Mount RMR Adjustable Red Dot Sight w/ MOA Dot Reticle

Had this unit for about 2 months, put about 1,000 rounds through my gen 3 g19 and no issues. Im running my custom milled slide with a BATTLE WERX plate (HIGHLY) recommend if you go this route.

When I first put this on the RMR was shutting off and dimming. For the glocks that are milled, make sure you have the right one shorter than the left because that is where the extractor rod is. If it is not the shorter screw you will have the same issues. The red dot is crisp and clean. The learning curve takes time to get use to but a day at the range I love this on my g19. WORTH THE MONEY. Also make sure you use Loctite on the screws, you will lose them if you don't use it .

The 2 main cons I would say have to be changing the battery out because you have to take off the red dot to change can alter your zero very slightly and for the price I would think that Trijicon would throw in a anti flicker plate instead of buying one from Battle werx

Will definitely buy another one if I mill out my g17