I had this as kid, it could fire real .22 ammo.
You had to drill the barrel and drum.
I was carrying that to elementary school, friend also had one. Different times.
Numerous revisions where made later to make it harder to convert it to real firearm like they moved slots on the drum to be over the bullet and not in between to prevent drilling.
It worked ok, accuracy was ofc shit, sometimes needle would pierce back of the casing causing nasty blowback right in the eyes, sometimes drum would not alight itself correctly making bullet tear itself apart in the barrel. Still have it somewhere.