Description
The P320 Full Size is a service-grade striker-fired pistol built around Sig Sauer’s modular serialized chassis system, which means the fire control unit is a self-contained component that can be moved between frames and grip modules of different sizes without tools. That design also makes the trigger group straightforward to remove for cleaning, since there is no external safety lever adding complexity to the draw or the maintenance routine. The striker-fired mechanism delivers a consistent pull weight from the first round to the last, which matters in any context where predictability under stress is the goal.
The 4.7-inch barrel gives the cartridge enough dwell time to build useful velocity while keeping the overall package compact enough for duty carry or range work. SIGLITE night sights are factory-fitted tritium units — the luminous inserts glow passively in low light without batteries, and they sit at a height compatible with most slide-mounted optic configurations since this pistol ships optics-ready. Each pistol comes with two steel 17-round magazines, so you have a spare loaded and ready without an additional purchase. The Nitron finish is Sig’s proprietary corrosion-resistant coating applied to the stainless steel slide, chosen for durability in field conditions rather than appearance.
Shipping and availability: This item cannot be shipped directly to California, Rhode Island and Washington. It cannot be sold into Illinois. Check your state and local requirements before ordering. This item must ship to a licensed FFL dealer for transfer.




