No not black, it’s a silver with a gun metal blackwash to it to appear like it’s been seared from heavy, automatic use. Shadow in the van makes it appear black due to the reflective nature of the surface, same way in this photo it appears completely silver due to the washed out effect from sunlight, set lights & overhead lights.
View attachment 717718
The prop Glock that does the automatic movement in this scene when he shoots the bus driver isn’t metal, but plastic, it actually functions. Yes, multiple Glock 17 props were used, the “real” one around close up shots, the plastic when in use. The prop gun that has the motor function is completely silver plastic, no wash, looks like the HT Glock.