One of the new features on the Gen 5 Glocks is the finish on the slide. The result is that the slide is noticeably a deeper, and richer black, which in turn makes it "not match" the frame's black color. That may bother some, others like me, are "meh, who cares." Below the description of the finish are photos of the slides of a Gen 5 Glock 17 and a Gen 3 Glock 17, both new and unfired. Also the barrels.
- nDLC finish for barrel and slide – GLOCK‘s nDLC provides tougher, more durable protection than previously used finish. The nDLC finish is exclusive to the GLOCK manufacturing process. The nDLC finish increases protection against corrosion and scratching and improves the ability of the pistol to function in degreased or adverse conditions. The nDLC finish will be exclusive to Gen5 pistols at this time.