"For Sale ---- World War II Italian rifle. Never fired, only dropped once."
Well, a Carcano Paratrooper's Carbine is certainly rare. So rare that even the Standard Catalog of Military Firearms doesn't list, or even mention, them.
list a Model 1938 Cavalry Carbine. This Carbine has a half-stock and a round "needle-type" bayonet and was made in both 6.5mm and 7.53mm. Is this what you have?
The more common Carcano with a folding bayonet is the Model 1938 Short Rifle. This was made in 7.53mm, has a full stock, and has a short, folding blade type bayonet.
What type do you have.....and what kind of condition is it in? (in English, please).