Having a more narrow FOV let's you focus on a single target better. Ironsights also would be an aiming aid because, some people don't use crosshairs.
The feature is already implemented in the game, why remake it with a clumsy weapon model? I could understand your argument if Blockland was a full-out FPS game, but it's not. If people don't use the crosshair, they should. It's an implemented feature with zoom, giving you the same thing as ADYS.
ok seriously... I hate using "F" personally I just wish we would make ironsights... COULD WE MAKE IT OR NOT?!
Both would still probably use the "f" zoom rate, so all you'd be getting is an overglamourized zoom.
I think it's possible.