S&W Model 15
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The Smith & Wesson (S & W) Model 15 is a combat version of the Model 14 differing that is has a ramped front sight and was available in 2" and 4" inch only. The M14 also sported 6" and 8-inch barrel.
The Model 15 was the standard issue sidearm of the United States Air Force until the adoption of the M9 Beretta 9mm in the 1980s.