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The Magnum Research BFR is a single-action revolver manufactured by Magnum Research. It is made from stainless steel and is manufactured in a variety of heavy calibers, such as .500 S&W Magnum, including some traditional rifle cartridges, such as the .30-30 and .45-70/.450 Marlin. The name "BFR" officially is an acronym for "Big Frame Revolver" or "Biggest, Finest Revolver". However, collectors and large-caliber enthusiasts have been known to misinterpret the acronym as "Big Fucking Revolver".