It's the "Big Frame Revolver" from Magnum Research, the same people who do the Desert Eagle.
https://www.magnumresearch.com/
"Big Frame Revolver" and "Biggest Finest Revolver" have been fairly interchangeable since the inception of the "BFR". The model is technically "BFR," and they've only been spelled out as "big frame" or "biggest finest" in the print of the marketing.
When the first were made by Sidewinder they were marketed as "big frame", then when DMax took on the contract, it was about 50/50 for those short years as "big frame" and "biggest, finest". Then in 2001 when Mag Research started making them themselves (bought out Dmax), the only thing you saw for several years was "Biggest Finest Revolver". When they updated their site to the new software a couple years ago, that's when the entry line on their website merged the two interpretations: "MRI’s Big Frame Revolver is truly the biggest, finest revolver on the market today."
Relatively speaking, the "Biggest, Finest Revolver" was much more prevalent than the "Big Frame Revolver" when you look at it's marketing history.
It even says "Biggest Finest Revolver" on the box.
And they use "Biggest, Finest Revolver" in their print advertisements. "Big Frame" is only used in website text currently.
Of course, colloquially, the BFR is known as the "Big F***ing Revolver"
