U.S. Stevens Model 520-30 Trench Gun, 12 ga. pump action military gun.  Serial #41098. Very good condition. 20” Cylinder Bore choked barrel with has an excellent shiny bore. The blue finish is 85% with handling wear and some nicks and scratches.  The receiver and barrel are marked “P over Flaming Bomb” proofs. U.S. mark above the trigger on the left side of the receiver. Heat shield with bayonet lug has some dings and scratches and the end has been re parked. The stock has military sling swivels, but has no cartouche or stamps. The buttplate is bright aluminum.  Green canvas sling.  A very cool piece of WWII history.  Highly collectible! There's nothing so fine as a wall full of Trench Guns! ALWAYS draws a crowd! C&R OK.