Your Model B is real similar to my 311 Savages. You pull off the forend. No tools needed. I forget if the B had a finger locking mechinism or if you simply pull. With the forend off put a hand on the barrels and simply open the action. Brace the stock under your arm and break the gun as if you are going to load it and pull down on the barrels. It should hinge off. If you used tools to remove just the wood of the fore end the forend Iron will prevent the barrels from opening far enough for removal.
Hope this was helpful.
Brian.
Hope this was helpful.
Brian.