The included factory letter confirms the current configuration when it was completed on June 11, 1953. The letter also lists factory return dates of June 19, 1957, December 11, 1957, and October 16, 1958, at one of which times it is likely the included second barrel set was added. The extra set measures 28" and has 2 3/4" chambers and "WS-1"/"WS-2" chokes. Chambers measure 2 3/4" with ejectors, chokes marked full/full, and 14 1/4" LOP.