Purchased a Model 12, serial # indicates manufactured 1914, purpose was for use in WILD Bunch SASS shooting. Classification calls for either 1897 or 1912 pump shotgun. Disassembled and cleaned thoroughly. Stiff and rough in the pump action. Worked over action lightly, polishing pump action. No help. How should I go forward? Back to Winchester or can someone recommend a smith that has worked with Winchester's or what is best route? I am located in East Tennessee. Any help appreciated.