The Glock 19X has all the Gen 5 features - i.e. barrel with new bore, ambidextrous bolt catch control, redesigned trigger mechanism, 2.25kg trigger guard, different firing pin and firing pin lock safety, etc. The X as a "Crossover" - it is a combination of the frame from the G17 and the slide from the G19. The pistol is partially based on the G19 MHS (Modular Handgun System), which along with the SIG P320 participated in a tender for a new service pistol for the U.S. Army. It differs from the Army version only in the absence of the ambidextrous manual safety on the frame.
But it also has a different magazine well shape. The frame has no finger recesses (like the Gen 5) but lacks a hole in the front for the extended magazine well. The shaft is also not flared at the bottom like the standard Gen 5. Instead, the frame is stretched down for tactical glove shooting. Due to the lack of a hole and stretch in the front of the pistol, Gen 5 magazines cannot be used. However, all other generations of magazines are compatible.
The pistols have such a new finish (nPVD slide coating / Physical Vapor Deposition) in sand color. The paint is applied by sputtering and vacuum steaming.