i was at i.m. crudgington in bath in 1996 the old man told m the building took shell in ww2 so not many gibbs records but comfirmed my 2 rifles as gibbs by what i told him and the B before the serial numbers,,in his shop he was building a 505 for someone in the mideast ,he had it on the bench in the back room still in the white stage he was altering a standard action ....paul