Just checked my Military Small Arms of the 20th Century.
The M38 model actually shoots 7.35X52mm, not 6.5 (I couldn't remember which model was the one they switched up to a larger caliber). According to the book, "As a result of their experiences in Abyssinia, the Italians found the 6.5mm cartridge was insufficiently lethal, and introduced an enlarged 7.35mm in 1938 along with a modified version of the 1891 rifle. Apart from the caliber, the Fucile Modelo 1938 had a fixed 300m rear sight in place of the earlier tangent sights"... this is slightly paraphrased but gets all the info over. Sorry about the caliber mixup, that's why I pulled out the reference book to check.
If you have an M38, it's a Short Rifle, which is 40in long, 8 lb 2 oz, 22 in barrel. Rifling is 4 grooves r hand twist. It actually has a six shot magazine capacity (I thought it was five). There is also a cavalry and special troop model carbine with a folding bayonet under the barrel, and a Short rifle 38/43 chambered (rebored) to 7.92mm apparently modified during 1944 but it's sort of a jury-rigged job and dangerous to fire.
The cavalry and special troop carbines had a 200m fixed notch rear sight.
The Standard M38 short rifle and carbine are ok though.