Yep. MOST real world pistols are blued or at least older ones. Some are parkerized. It makes for a more convincing prop, look at the photo on Hollywood Collectible Group (that shows the blued receiver).
Parkerized is more durable, but you can replicate that look over plastic, bluing can only be done on metal.
I don't like the parkerized finish, if that's what he's using. Sure, the finish of WW2 1911s is parkerized and it's functional but that's not true of most firearms today and certainly not true about handguns used in law enforcement which is blued. Even matte blue is prettier than parkerized which looks bland.
I'm actually less interested in replicating the prop as I am in replicating the blaster as it appears on the screen. The blaster of my imagination for the past 30 years is blued steel because that's how it looked on the screen. It didn't look weathered nor did I see wires sticking out of the cylinder.It might not look like a modern firearm, but how does the finish look compared to the original prop?