Can anyone tell me what I have here? I have owned this shotgun for years and always thought it was just long barreled military shotgun. I was told recently that due to the sling swivel and magazine tube it looks to be an arsenal rebarreled trench gun. Any help greatly appreciated.
https://www.milsurps.com/vbpgimage.p...3&d=1321470939
https://www.milsurps.com/vbpgimage.p...4&d=1321470964
https://www.milsurps.com/vbpgimage.p...5&d=1321470975
https://www.milsurps.com/vbpgimage.p...6&d=1321470984
https://www.milsurps.com/vbpgimage.p...7&d=1321470989
https://www.milsurps.com/vbpgimage.p...8&d=1321470997