The perfect plate for halosun 507 - C&H Precision Weapons Optics Adapter Plate Walther PPQ/Q4/Q5

Walther will give you a free plate if you ask, but the choices are limited to a hand full of red dots and the 407/507s are not one of them. Thins thing fits perfectly and holds the dot at zero without any problems. I did get a little nervous when none of the screws that came with the dot fit, but ONE set did. It had to the be the ones with threaded nuts on the bottom of the plate for the Q4 SF. It was worth it, but it is pricey for such a tiny little metal plate.