SIG SAUER P320 — 9×19mm (Semi-Auto, Modular Pistol)

• Model family: P320 (modular striker-fired pistol platform)

• Caliber: 9mm Luger (9×19mm)

• Action / Operation: Striker-fired, semi-automatic

• Modularity: Removable serialized fire-control unit (FCU) — allows conversion between frames, sizes, and calibers using replaceable modules

• Frame / Grip: Polymer chassis/frame (various grip sizes and textures depending on model)

• Slide / Barrel Material: Steel slide and barrel; nitride/blacked or stainless finishes common

• Barrel length: 3.6" (subcompact) 

• Capacity: 15+1

• Sights: Removable / dovetail-mounted iron sights (three-dot, night-sight options, or optics-ready on some models)

• Trigger: Factory striker-fired trigger (factory pull typically in the mid single-digits in pounds; varies by model and aftermarket upgrades)

• Controls / Safeties: Standard controls include slide stop, takedown lever, reversible magazine release; manual thumb safety present on some variants; striker block/internal safeties standard.

• Accessory options: Many models are optics-ready (plate cut for micro red-dot), and some have MIL-STD accessory rails on full-size/compact models. Numerous factory/configuration options and third-party accessories available.

• Intended use: Duty, concealed carry, and modular multi-role use — popular for law enforcement, civilian carry, and competition due to modularity and multiple size options.