This specific model denotes a semi-automatic pistol manufactured by Sig Sauer. Chambered in .40 Smith & Wesson, it features a traditional double-action/single-action (DA/SA) trigger mechanism. This means the first trigger pull is longer and heavier (double-action), cocking the hammer and firing the cartridge. Subsequent shots are fired in single-action mode, with a shorter, lighter trigger pull. The designation also specifies the compact frame size of the pistol.
The combination of manufacturer reputation, chosen caliber, and operating mechanism has made this firearm a popular choice among law enforcement and civilian users. The .40 S&W cartridge offers a balance of stopping power and magazine capacity. The DA/SA system provides an added layer of safety against accidental discharge, combined with a consistent trigger pull for follow-up shots. This pistol’s compact size also contributes to its concealability, making it suitable for concealed carry or as a backup firearm.