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Donald, The only difference is the grip the "B" in BFR45707B stands for Bisley Grips for one handed target shooters. The BFR45707 has the standard traditional square butt grip. BFR= Big Frame Revolver
Michael W.
7 years ago
Donald, they are the same "Core" Revolver. Only the Grips differ (Bisley Grip vs Standard Grip). Details of Grip options here : https://www.americanrifleman.org/articles/2017/5/11/new-grip-options-for-the-magnum-research-bfr/
James G.
7 years ago
the grip style the B model has the more rounded Bisley grip
Randy I.
7 years ago