O fuk Isfahan has 1911 posts? YOU KNOW WHAT TIME IT IS
The M1911 pistol was designed in—you guessed it—1911 by John Moses Browning and originally produced by Colt. It served as the US military's service pistol for over 70 years, with it still in service today, over 100 years later (though not as the primary issue pistol, as it was phased out for the 9mm Beretta M9 pistol in 1985). Improvements to the design arrived during the interwar period as reports from soldiers revealed several ergonomics and safety issues with the pistol, particularly for shooters with large hands, and in 1924 the M1911A1 became more or less the design still used and loved to this day.
Aside from the desert-beige moly resin coating, the laminate hey-look-at-me grips, the commander-style hammer, the forward slide serrations, and the accessory rail (RRRAILZZZ), this pistol is still recognizable by its 100-year-old silhouette.
The M1911 fires the .45ACP cartridge. It was designed specifically with the M1911 in mind: after all, the "ACP" stands for "Automatic Colt Pistol."
Here it is again in a size comparison with other popular cartridges. The .45ACP is the short fat fucker in the middle.
The .45ACP round has advantages and disadvantages. For one thing, in terms of bullet speed it's a very slow round—normal propellant loads for a .45 will not be able to get it to supersonic speed. As a naturally subsonic round, however, the .45 lends itself well to suppressed firearms. Being a fat, heavy bullet, the .45 bleeds its energy more quickly than many other pistol bullets, though extremely close up it hits very hard and suffers less from overpenetration that smaller, faster bullets might have to worry about. The .45's notable stopping power is offset by its size, which limits firearms like the 1911 to a relatively low clip capacity, especially given its slim grip design will only accept clips with the .45ACP cartridges seated directly atop one another in a single-stack configuration. Of course, double-stack 1911s have been made to address the low-capacity problem, but .45 is still a heavy round and its fatty-fat-fatness destroys some of the ergonomics of the pistol, as seen here:
That's a double-stack 1911 at the top, and they are only comfortable to shoot if you have freakish gorilla hands.