Hi CJ. I'm no expert but I do have a Fox A grade, 1913 gun, w/original 3" chambers that measure 2 7/8". Bores of my gun are .724, chokes are factory IM/F and are 4"+ in length. 32" barrels are stamped #1 and weigh 66 oz.

So....without a letter or copy of the factory build card to say otherwise I'd consider your B to be a legit 3" gun with #1 barrels. Do your barrels have the reinforced wedge like mine?


Mike C