Bought this 1897 Winchester shotgun and told it was riot shotgun. It is the take down model and the serial numbers match the barrel and receiver. Serial number 941,XXX makes it about1942. There is a US stamp and flaming bomb on the left lower side of receiver and a flaming bomb on the top of the barrel. The butt stock has a milled place where the sling mount would have been mounted but is missing. The barrel has the 2 grooves for a trench gun bayonet mount. Someone has installed a Weaver external choke system to the barrel. Still has the Winchester butt plate but is well worn. Need to know if it's a trench gun or riot.