The EGW red dot plate is a perfect fit for the Walther Q5 Match SF. It's thinner than the factory plate, but a little thicker than another brand of red dot plate. I always got a warp in the other brand plate when I tightened it down, and didn't care for the iron sight in front of the red dot. The EGW is thick enough to have a good solid rigid base for the red dot. I used M3x8 socket head screw to fasten the plate to the slide with blue loktite. It has held firm after several 400 round practice sessions. These are hard practice sessions 3 to 4 hundred rounds in an hour to an hour and half. Highly recommend!!