I understand that's the part. The other thread is inconclusive about the origin of that sling attachment. I'm not sure. There's several around here that will know for sure but they haven't surfaced yet. Anyway, according to Canfield, most riot guns didn't have sling swivels. The one he illustrates was cut down from a full length gun in Anniston Arsenal and has a sling swivel installed under the front cap. Not on the front. The nature of the front cap swivel on yours might help to determine when it was installed. But if the rear swivel is correct...then...maybe? Winchester did use sling hooks.