The SIG P320 is a modular semi-automatic pistol designed by SIG Sauer. It features a unique design that allows users to easily change the grip size and caliber by swapping out components. This versatility makes it popular among both law enforcement and civilian shooters. The P320 operates using a striker-fired mechanism, which provides a consistent trigger pull. It is available in various sizes, including full-size, compact, and subcompact models, catering to different preferences and needs. The pistol is known for its reliability, accuracy, and ease of use, making it a favored choice in the firearms community.