Zoom is a Hidden Stat that states whether a weapon can aim down its sights (zoom in) without a Scope. It is practical for fighting enemies at mid to long ranges where using the hipfire crosshairs is no longer a practical option. Zooming is particularly effective in getting headshots and is typically used in ranged combat. When a weapon is zoomed, the crosshairs tend to get tighter, while some don't. This is to replace the "ADS" (aiming down sights) system most games have that A.V.A doesn't. Due to the lack of iron sights, zooming was implemented.
All Rifleman weapons that are outfitted without a Scope have this ability, while choice Pointman weapons have this ability as well. No Sniper weapons have this ability, because they are all outfitted with a custom scope meant for long-range combat.