This designation refers to a specific category of semi-automatic pistols: a smaller, more easily concealed variant of the classic M1911 pistol, chambered for the .45 ACP cartridge. This powerful round, combined with a reduced frame and slide size, makes for a firearm favored by those prioritizing both portability and stopping power.
The reduced size enhances concealability for everyday carry, while retaining the familiar controls and ergonomics of the original design. This balance of power and portability contributes to the enduring popularity of this firearm style for personal defense. Its historical lineage, rooted in a proven military sidearm, adds to its appeal for many enthusiasts.