The SIG P320 is a popular and highly versatile semi-automatic pistol manufactured by SIG Sauer. It was first introduced in 2014 and has since gained widespread adoption among law enforcement, military, and civilian shooters due to its innovative design and modular platform. The SIG P320 is built on a modular chassis system, allowing users to easily change the grip size, frame, slide, and barrel length. This modularity enables shooters to customize the pistol to suit their preferences and needs, making it suitable for various applications, including duty carry, concealed carry, home defense, and competition shooting. The P320 is available in several popular calibers, including 9x19mm (9mm Parabellum), .40 S&W, .357 SIG, and .45 ACP. Users can switch between different caliber options by swapping the slide and barrel. The P320 is a striker-fired pistol, which means it uses a striker mechanism instead of a traditional hammer for firing. Sig Sauer offers the X-Change kit for the P320, allowing shooters to quickly convert their pistol to different configurations without the need for special tools. The P320 features ambidextrous slide stop and reversible magazine release, accommodating both left and right-handed shooters. It comes with several safety features, including a striker safety, disconnect safety, and optional manual safety on some models. Many variants of the P320 come equipped with SIGLITE night sights, offering excellent low-light visibility. The SIG P320 has earned a reputation for its reliability, accuracy, and adaptability. Its modular design and ability to switch between calibers and configurations make it a popular choice among firearm enthusiasts and professionals alike.