This is an absolutely outstanding example of a very scarce and desirable World War I Remington-UMC Model 10-A trench shotgun, manufactured under a U.S. Army contract for 3,500 and found in the reported serial number range of 117731-165566, with most being reconverted back into riot or sporting shotguns over time. A Model 10-A trench shotgun is considered the apex of any U.S. Military shotgun collection. The Remington Model 10 shotgun was originally designed by the well respected Engineer John Pedersen; with the Model 10-A trench variation featuring a 23-inch barrel, wooden handguard, and bayonet lug for use with the M1917 bayonet. Serial number "U/159752" marked on the front underside of the receiver, and the barrel is marked with the matching serial number "159752" upside down on the lower right rear side of the breech, with "CYL" choke marking on the bottom of the barrel. The unmarked bayonet lug adapter has a silver bead front sight, with a flaming bomb stamp above "US" on the left side of the receiver. Fitted with an oil finished walnut handguard, ribbed pump handle, smooth pistol grip buttstock, and a checkered hard rubber buttplate with the Remington-UMC trademark logo. Sling swivels attached to the front end of the magazine tube and underside of the buttstock. 13 3/4 inch length of pull. Includes a Remington manufactured U.S. M1917 bayonet dated "1917" on the blade, with an olive drab green painted leather scabbard, a full 25-count World War I era "U.S.PROPERTY" marked box of Remington-UMC brass shell 12 gauge 00 buck ammunition with no. 58 primers, and two tan canvas shotgun ammunition pouches with "ORD DEPT/INSPTD" stamped in ink on the interiors of the flaps.