This is a beautiful example of a very late production WWII U.S. Army contract Stevens Model 520-30 trench shotgun with the correct bayonet lug adaptor and ventilated handguard. The right side of the barrel has the Stevens Company three-line address along with a small "P/Ordnance bomb" proof while the left side has the two-line markings of: "PROOF TESTED-12 GAUGE/-2 3/4 INCH CHAMBER-", with no barrel/bore choke markings. The left front edge of the receiver is stamped with a small "P/Ordnance bomb" proof followed by "MOD. 520-30", and towards the rear it is stamped "U.S." It is correctly serial numbered "70756" on the rear end of the trigger guard tang. It has a matte blued finish on the receiver, barrel, magazine tube, pump handle, while the heat shield has a high polish blue finish, with the correct pinkish tint on the bayonet lug due to its alloy metal construction. It is fitted with a smooth walnut forearm and pistol grip stock with a black plastic buttplate. The stock and bayonet lug are correctly fitted with sling swivels.