Sweet Model 12!!! Our military sure loved them. Can you get a better reference than that???

http://www.militaryfactory.com/smallarms/detail.asp?smallarms_id=672

By the time World War II began, stocks of shotguns were too small to support the mobilization and new orders were placed. The well regarded Winchester Model 12 trench and riot guns were again procured with a total of more than 80,000 guns ordered by the U.S. Government by 1945, more than any other combat shotgun of the time.

The Model 12 remained as the primary combat shotgun, used heavily by the USMC in Korea and until the Vietnam War where they again served

http://olive-drab.com/od_other_firearms_shotgun_m12.php