On a 1897 Winchester "trench gun" shotgun, what type of sling was issued? Was it the leather sling that was used with the 1917 and Springfield? What model of bayonet would be correct?
As I understand it, yes, the same sling as that issued with the M1903 or the M1917.
The bayonet was the standard M1917 bayonet.
I'm not 100% sure, but I THINK that the M1905 bayonet would also fit the shotguns, but most of these had been withdrawn from service by the time the US entered the war.