Winchester Model 1897- a repeating rifle designed by John Moses Browning. The Winchester Model 1897 evolved from the Winchester Model 1893. When working the action of the Model 1897 the fore end is racked and a long slide comes out of the receiver and ejects the spent shell while simultaneously cocking the external hammer. This is why the gun is classified as an action pump shotgun. Cal.16 had a standard barrel length of 28 inches, while cal. 12 was furnished with 30-inch length barrels. The Winchester Model 1897 was in production from 1897 until 1957. During World War I Model 1897 was introduced as M1897 Trench Gun and it was used while fighting in a trench. It was furnished with 20'' length barrel, in caliber 12, an adapter with bayonet lug and sling swivels.