While John Moses Browning's initial designs were focused on turning a principle into a working firearm, the finished products were characteristically simple, robust, reliable, and functional. Agood example of this is the Colt .45 automatic pistol, officially known as the "U.S. Pistol, Automatic, Caliber .45, Model of 1911," which is commonly called the Colt Model 1911. The Model 1911 was an improved version of the Colt Model 1900, the first auto-loading pistol produced in America.

The Model 1911 used a short-recoil system, in which the barrel and breach travel together a short distance to allow the bullet to pass the muzzle before the breach opens. This process is accomplished with a simple linkage between the barrel and the frame of the pistol. The breach is housed in a slide that moves backward and forward on rails. When a round is fired, the barrel and breach are initially locked together. The force of recoil forces the cartridge case back against the face of the breach. This drives the barrel and slide together for a short distance until the pivoted linkage between the barrel and the frame unlocks and disengages the barrel while the slide continues rearward. During this motion, a simple extractor grabs the empty cartridge case. As the slide continues backward, it compresses a recoil spring, cocks the hammer, and when it stops, ejects the empty cartridge case. Pressure from the recoil spring then pushes the slide forward. As it goes forward, the slide pushes a new round from the magazine into the chamber, the barrel pivots upward, and the breach locks into place. When the trigger is pulled again, the hammer falls, hitting the firing pin to fire the next round and initiate the cycle again. The mechanical elegance of this design is that each action performs multiple tasks.

The design of the Model 1911 coincided with the end of the Philippine-American War, in which U.S. troops faced natives who often continued to fight after sustaining numerous hits from lighter-caliber pistols. As a result, Browning chambered the new pistol for the .45 ACP (automatic Colt pistol) round. By combining a powerful round with a robust frame and a simple operating system, Browning created a weapon that was demonstrably effective and reliable in field conditions. This design was adopted by nations worldwide, including the United States, where it was issued from 1911 to 1985. The essential system used in the Model 1911 was also similar to later Browning automatic pistol designs such as the Browning Hi-Power, manufactured by FN. These two designs have served in armies in almost every Western nation as well as those nations supplied by the Western powers.

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