Grey Ghost Precision Version 3 Pistol Slide w/ RMR-DP Pro Cut Glock 19 Gen 4 17-4 Stainless Steel Olive Drab Cerakote GGP-19-4-OC-OD-V3. They are machined from 17-4 Billet Stainless Steel to have tighter tolerances than a factory slide. They are Black...