A six-shooter is a small gun that holds six bullets.
six-shooter in British English
noun
US informal
a revolver with six chambers
Also called: six-gun
six-shooter in American English
(sɪksˌʃutər)
US
noun
Informal
a revolver having a cylinder that holds six cartridges; specif., such a revolver with a long barrel and of relatively large caliber of the kind usually used in the western U.S. in the last half of the 19th cent.