Uhhhh - unfortunately, that is a rifle sight, and yes, someone has butchered an 1896 handguard to make the sight fit. The stock is the later 32" M1899-style replacement, and the sling swivels have been added.

Does the barrel length/muzzle crown/front sight check out? It should, because that is definitely a carbine number. Looking at the stock, I can see the band spring, so the rifle sight is apparently just an anomaly.

You still did OK, hope it shoots well!