You can find the Grey Ghost Precision Slide Version 4 for Glock 19 Gen 4 here.

The Grey Ghost Precision Slide Version 4 is the result of feedback from combat instructors and shooting professionals. Designed with a top window cutout and microscale pattern texture for a higher level of frictional grip on the slide. The Grey Ghost Precision Slide has a dual compatibility optic cut, which is milled for either a Leupold Deltapoint Pro or a Trijicon RMR when using the included aluminum shim plate and screws. Machined from 17-4 Billet Stainless Steel to have tighter tolerances than factory slides and Black Nitride Coated inside and out for easy cleaning and corrosion resistance. Easy to install with no gunsmithing required.

Firearm: Glock 19 Gen 4
Color: Black Nitride Finish