Old school master key
Here we see a 12 gauge Winchester Model 1897 shotgun as modified for military service then subsequently whittled down sometime later. This pump-action smoothbore was reportedly utilized by a Florida police department as an entry weapon for raids and is currently in the collection of the National Firearms Museum.
The trench gun, likely passed on after World War II from military stores, is a really well done chop, with the brass buttplate being moved up to the end of the abbreviated stock.
As noted in Canfield’s excellent U.S. Infantry Weapons of World War II, some 20,000 M1917 Trench Guns were ordered during the Great War and as many as 48,000 subsequently modified ’97s during the second, all with the ventilated hand-guard, sling swivels and Enfeld bayonet adapter.
After 1945, with the Army purchasing upwards of 500,000 commercial shotguns of all kinds for training and constabulary use during the conflict, among the first surplused out was the Winchester trench brooms– making them exceedingly rare in original condition today.