EDIT : These are indeed the correct boots but It has been pointed out to me that these boots come in two different height sizes 6" and 8"
Have tried to confirm which size is the hero but cannot find anything that tells.
Nope, definitely not a COP .357. Barrel's too long. I can't really see its full profile, but with that trigger guard, it could be anything from a Sig Sauer to an H&K to a Walther, or anything in between. It could also be a spankin' new cobble-job, ala the original PKD, just waiting for a new forum to decipher.
That is way too big overall to be a COP, even with a long barrel. They're on the smaller side. I'm guessing that's a revolver in a shell. It doesn't seem to cycle when it's fired. Could be a total fabricated piece with a CGI muzzle flash too.