I’m not sure I agree (with myself…) either. Pure speculation. It’s a limitation of the translation. And gun adverts haven’t always been written in the clearest language.
Fascinating that they’d make what appears to be a pretty serious “adult” type rifle, but design the breech block to be able to take darts. With all the implications that would have for the effect of that much freebore on pellet accuracy.
I was wondering if we had any Italian members.
Anyway, I have cheekily emailed FABARM to see if they can provide any more info. Probably not, but worth a punt.