I believe AZ stopped making them in 2020.
I've had a couple of them, and they are light. The HVA billets used to make the 1900 actions are hammer forged but AZ machined them from stock steel.
One of the rifles I had was chambered for 30-06 and the other was rebarreled by me to 338-06, which for me, was a mistake. The light rifle made the platform a "hard recoil" shooter and a half dozen rounds would leave bruises after a bench session. In the field, recoil is easier to absorb.
It's one of the reasons I bought a Kimber, chambered in 270Win. They are just a bit lighter than the Antonio Zoli 1900s, and both have the small ring actions, but the Kimber is much pricier than the AZ, even the higher grade models.
As far as accuracy differences between the two, both averaged 1.5 moa with typical premium off the shelf ammo and a bit better with hand loads.