U.S. Stevens M520-30 "Trench Gun", 12 ga. pump action combat shotgun. Serial #63947. Very good condition. First used in WWII, then the Korean War and then Vietnam and are one of the "Holy Grails" of the military shotguns as most perished in the jungle environment of Vietnam. After Vietnam some were issued to cop shops and prisons. This specimen is very nice and correct with 20" barrel, excellent shiny bore, tight action, heat shield and bayonet lug for Model 1917 bayonet (not included). Ordnance marked with "U.S. on the left side of the receiver. Wood is very good with some marks as expected. Some corrosion marks on receiver and barrel as expected. Leather military sling. A dandy! These are ultimate display piece for your military collection! Three war military history here! C&R OK. Gunrunner West item.