Doubleshot

Doubleshot
Doubleshot grants a character a chance to make an additional attack roll with their ranged weapon any time they make a ranged attack. The additional roll is made on the target of the initial attack. Doubleshot only applies to ranged attacks.

Doubleshot was introduced as part of the Update 19 combat changes. Many attack speed bonuses were converted to Doubleshot effects at that time.

Repeating crossbows receive a reduced benefit from Doubleshot (rumored to be at 1/3 effectiveness []). Using Manyshot and Ten Thousand Stars feats reduces your doubleshot chances by 100% for a time, effectively negating its effect.

Sources of Doubleshot
Feats
 * Doubleshot - ML28 Epic Destiny Feat - Passive 10% Doubleshot
 * Double Shot Primal Past Life Stance: +3% Doubleshot per stack of this Past Life.

Enhancement bonus
 * Category:Doubleshot items
 * Random items with Rapid Shots suffix

Class enhancements
 * Arcane Archer - Core ability 5 - Shadow Arrows: Arcane Archer Secondary Imbue Toggle: +5% Doubleshot chance with bows.
 * Arcane Archer - Core ability 6 - Master of Imbuement: Passive 10% Doubleshot chance.
 * Deepwood Stalker - Tier 4 ability - Killer: 5% morale bonus to Doubleshot chance per stack. Earn stacks by killing. 15s duration. The Killer buff can stack up to 2/3/4 times.
 * Assassin - Tier 4 ability - Killer: same as DWS Killer
 * Mechanic - Tier 5 ability - Rapid Fire: Passive +3%/6%/10% Doubleshot
 * Kensei - Core ability 3 - Strike With No Thought: Passive 3% to 6% Doubleshot depending on how many Kensei core abilities you have.
 * Kensei - Core ability 6 - Alacraty: Passive 15% Doubleshot

Race enhancements
 * Elf - Tier 4 ability - Skill: Passive 3% Doubleshot
 * Morninglord - Tier 4 ability - Skill: Passive 3% Doubleshot