Need Help Determining What Type of Carcano I Have

[RR17]

Based on the year and nose cap, I’d say you have a M91TSM (M91/28) that was likely made as a M91TS in 1917 with the longer nose cap, the bayonet stop near the front site, and side sling loops, and then converted to the 91TSM sometime afterwards by switching the nose cap and adding bottom sling swivels. I’d be happy with it.

Edit: Somehow I missed Old Paul’s answer saying basically the same thing.