The Zarr can switch between two different firing modes using its Alternate Fire button. These modes are officially named Cannon mode and Barrage mode;
Cannon mode fires an explosive projectile in an arc that explodes on impact, dealing 175 Blast damage within a ~5m radius, then splitting into 6 smaller projectiles that spread from point of impact and home in on targets, each dealing 50 Blast damage within a small radius.
Barrage mode works in a shotgun-like pattern, shooting 7 pellets in a wide spread, dealing Physical damage, shoots faster than primary mode and has innate Punch Through. There is no damage fall-off with distance, but pellets will deal no damage at all if target is further than 15 in-game meters away.
Multishot mods will increase the amount of bomblets that are produced from the Cannon shot as well as increasing the pellets of Barrage mode.
The Zarr's current firing mode is indicated by orange text next to the Zarr's current Rank. Additionally, switching to Cannon mode is indicated by two short clicks, while switching to Barrage mode is indicated by three short clicks.
The player should also take care in that the Zarr will always start in Cannon mode after Respawning, beginning a mission and switching to and from Archwing, resulting in the user possibly triggering self damage if used inside close quarters.
Each shot is loaded manually into the gun. Reload shows time required to fully load the gun, and is accordingly increased by mods like Magazine Warp. Reloading can be interrupted by firing the gun, provided at least one shot is loaded.
The Zarr is unique in the fact that it can quickly switch to a close range function that has no chance of damaging the player, allowing it to be used in tight spaces safely.
While the Zarr has an average critical chance, its above average critical damage makes a crit build viable.
The Zarr's individual reload mechanic is useful when reloading before the magazine is emptied as the reload will be shorter than the listed value. This is beneficial for situations where players need to fire a shot immediately, but cannot wait for the full reload to complete.