I am downsizing some of my parts. This is a new Sig Sauer Full Size Caliber xChange kit. This includes the Slide, Barrel, Recoil Spring, Grip Module, Magazine and original Case. I am not sure about the availability of these in 17 Round anymore, but I am selling it at a discounted price. This is a 9mm conversion kit. The included magazine is a newer style that will work with an X-Grip Module. The slide also includes Night Sights.