I actually knew it was a performance center gun, just didn't know the number, so many models to keep track of. I used to have a 357 that had a similar look, fun to shoot. Was an impulse buy though so I got rid of it, really don't shoot any more at all. No time or money.
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Smith & Wesson Performance Center Model 629
I'll be damned! Looks more accurate than my guess.
that IS the gun vin diesel used in xxx, though (heavily-modified)