Mounted a vortex viper on my PPQ M2 .22 Mount fits very tight but instructions were very helpful as it’s a slightly tapered fit and is only designed to go in one way. I know I’ve read a few reviews about how hard this was to install and a few people even said it required some filing on the slide?! But I thought it was super easy. Like pressing any new sight in would be. You can see in my pictures that the mount is clear of the slide so no modifications were necessary. The mount and Optic hold zero so I’m very happy about having the option to install a red dot on this pistol that doesn’t have an optics ready option. Great product! Highly recommended!!! I’ll probably buy another for my XDS that also has no optic version