In a single column magazine, the rounds are stacked one on top of the other.
Early semiautomatic pistols (e.g. the Luger, M1911) had single-column magazines, which were easier to manufacture with early pistol technology than double-column magazines, which came into vogue in the 1930s with Dieudonne Saive's Browning Hi-Power design. Since then, most combat pistols have had double-column magazines, which afford greater capacity or rounds fired before reloading. One benefit of single-column magazines, however, is that they allow a handgun to be designed more narrowly than double-column designs. This is particularly evident in the M1911, which despite its large overall size and weight, has a flat profile, even by today's standards, making the gun easy to conceal for discrete carry. Many modern pistols designed for concealed carry use single stack magazines (e.g. the Kel-Tec P3AT, Kahr PM9,GLOCK 36 and many others).
A double columnmagazine (also referred to as double stack magazine) is a magazine in which cartridges are stored in two side-by-side stacks, offset by half a cartridge height and resting against one another.
Firearms which are older (or designed to be small) may use the simpler singlecolumnmagazine where cartridges are stored in a singlecolumn in the magazine box.
The magazine was prone to misfeed the cartridge since the lips deformed from the stresses of holding back so many rounds due to the tight springs required to exert enough force to overcome the friction generated by the guide walls.
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