LUCK IN THE CHAMBER - One random bullet in the magazine causes considerable bonus damage.
One round in your magazine will grant 33% bonus damage
In Destiny, LUCK IN THE CHAMBER is a Weapon Upgrade that can be found on all Hand Cannons & all Scout Rifles in the game. Weapons in Destiny pull each Upgrade at random from specific pools (with a few Weapons that are an exception). One bullet in your magazine does +33% damage.
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:
HAND CANNON WEAPON UPGRADES
SCOUT RIFLE WEAPON UPGRADES