What’s the difference between accuracy and deviation?
Accuracy is the cone within which a weapon’s shots will land. Higher accuracy equates to a narrower cone, resulting in more shots landing where the player is aiming.
Deviation is the random spread of shots within the accuracy cone. Deviation generally increases with recoil—that is to say, the longer the weapon is fired uninterrupted, the more the shots will deviate from the center of the accuracy cone—lower deviation results in more shots landing where the player is aiming under sustained fire.