The Socom Gear ZEV Custom Trilobite Cut Slide is made out of CNC aluminium and is about 25 grams lighter than the original version. This will allow your WE Model 17 to feel a lot snappier while shooting which is a great bonus. It also comes with a steel outer barrel increasing its durability.
The problem with the original slide is that it was a little thicker than their real steel counterparts so fitting them into real holsters was always an issue. With this slide, you'll be able to fit it into any holster made for the G17 series.