First impressions - Holosun HE509T Reflex Optical Red Dot Sight

This is my second Holosun optic. Unfortunately it does not fit my Wuelf Glock 19 Gen 3 slide. I believe the slide RMR cut and threads to be out of spec, and not the 509 adapter plate and screws. I would advise you buy a in-spec slide, and not something cheap like I did. Unfortunately I was not able to use it, as I have to buy a better quality slide. Regardless, the 509 looks and feels of great quality. The only downside is that Holosun did not send me a spare battery tray.