Shades's Revolver

 is a gun. It increases Coolness by 3, decreasing the cooldown of active items and increasing the chance of items dropping upon clearing a room.

Trivia

 * This gun is wielded by the boss Shades.
 * The pickup line "Someone Loses An Eye", could be a reference to the latter part of the phrase "It's all fun and games until someone loses an eye."
 * The corresponding pickup line of Smiley's Revolver, "All Smiles," is likely a corruption of the first part of the phrase.
 * The "notches" referenced in the Ammonomicon Entry are usually indicative of a soldier's confirmed kills. As such, it is implied that Shades has killed 17 Gungeoneers.