If you read the Jäger Platoon web link I posted, with my qualifications about how, apparently, many Finns viewed the Italian rifle, you would shortly discover that at the end the author commented on actually firing and handling the "Terni." He had nothing bad to say about it at all.
Inference?
As for equipment provided to Finland, during the Winter War a lot of stuff was effectively donated or sold at very reasonable terms. Much of it arrived to late for the Talvisota/ Winter War, but was pressed into service during "Finland's War of Choice." Italian M33 steel helmets were provided. These are an excellent design, and continued as the Italian army helmet under Nato until modern composite helmets arrived on the scene.
Something like 150 naval mines, 100 82mm mortars, 12 76-mm AA guns, 48 20-mm light AA cannon, 12 47-mm AT guns with 25k shells, 17 Fiat fighter planes, and 28 flamethrowers came to Finland from Italy. Also 150 volunteers. And the 94.5k "Terni" 7.35-mm rifles with 50mil. cartridges for them.
The then Union of South Africa sent 25 Gloster Gladiator biplanes.
The United States sent 44 Brewster Buffalo aircraft, which are often derided, but the ability to use 87 octane fuel was a god send, and a number of Finnish air aces used the type.
France sent 5k Chauchat "fusil mitrailleur" with 11m 8-mm Lebel cartridges, 20k hand grenades, 40 of their 25-mm AT guns, radios, 155-mm and 105-mm howitzers, and some old cannon--136 in all -- that predated and did not have without modern recoil systems. In fact, the last use of such ancient 19th century artillery--actual shots fired in anger was by Finn artillerists.