PERSISTENCE - This weapon grows more accurate the longer it is fired.
Accuracy increases over time the longer the trigger is held down, up to 20% by the end of the magazine
In Destiny, PERSISTENCE is a Weapon Upgrade that can be found on Uncommon, Rare and Legendary Auto Rifles and Machine Guns. Weapons in Destiny pull each Upgrade at random from specific pools (with a few Weapons that are an exception).
To see more info on exactly which Weapons this Upgrade can be found upon click the link below:
To see more about how this Weapon Upgrade fits into these pools, please click the links below:
AUTO RIFLE WEAPON UPGRADES
MACHINE GUN WEAPON UPGRADES