Sling

 is a gun that fires rocks that bounce once. It deals 2.5x damage to bosses,  and deals double damage if it bounces.

Trivia

 * The Sling's damage multiplier when used against bosses is a reference to the biblical tale of David and Goliath.
 * This damage multiplier makes the Slingshot the most powerful D quality gun against bosses, contradicting it's Ammonomicon entry.
 * Both the flavor text "Outrageous!" and the Sling's Synergy with the Bow are references to the famous "To be or not to be" soliloquy in Shakespeare's Hamlet, in which Hamlet refers to enduring "the slings and arrows of outrageous fortune".
 * Using this gun as the base for Duct Tape grants the other projectiles the bonus damage against bosses.