I'm not sure how many differences there are between the 12 and the later 1200, but there's a manual for that one at http://www.biggerhammer.net/manuals/
Try to find a copy of TM 9-2117, it's the military manual for the 12. "Field and Depot Maintenance, Winchester Riot-Type Shotgun M12 and Stevens Riot-Type Shotguns M520-30 and M620A"
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