If the ownership of the land is tenants in common, then it is not strata titled. ( first point)
Strata title is where an entity called the owners corporation owns the land and buildings and each lot owner owns a cubic space.
Secondly, my understanding of the gun laws is that one can shoot on common property ( within some restrictions) with the permission of the land owner. Since this land has multiple owners, everyone would need to agree to the shooter.