The SIG Sauer P320 FULL-SIZE is a modular, striker-fired pistol built for duty, competition, and serious defensive use. Its serialized fire control unit allows for caliber and grip module swaps, making it a future-proof platform. Since we started stocking it in mid-2024, it has consistently been one of our top-selling full-size handguns.
Key Features
- Modular Fire Control Unit (FCU): The serialized chassis is the firearm, enabling quick swaps of grip modules, slides, and barrels for customization or caliber conversion.
- Striker-Fired Reliability: A consistent, crisp trigger pull with a short reset for rapid, accurate follow-up shots.
- Optics-Ready Platform: The slide is machined from stainless steel and is cut from the factory to accept SIG Romeo1Pro and other popular red dot sights.
- Superior Ergonomics: The contoured polymer grip module provides a secure, natural point of aim right out of the box.
- Enhanced Safety: Features include a striker safety, disconnect safety, and optional manual safety models.
Specifications
| Caliber | 9mm |
| Barrel Length | 4.7″ |
| Overall Length | 8.0″ |
| Height | 5.5″ |
| Width | 1.4″ |
| Weight (measured) | 2.6 oz (FCU only, on our scale) |
| Capacity | 17+1 Rounds |
| Sights | Steel Contrast, Optics-Ready Cut |
Frequently Asked Questions
Is the P320 FULL-SIZE optics-ready?
Yes. The slide comes from SIG Sauer with a cutout designed to directly mount the SIG Romeo1Pro optic. Adapter plates are available for other popular red dot footprints.
What does modularity mean for this pistol?
The serialized component is the internal Fire Control Unit (FCU). You can legally change the caliber, size, and feel of the pistol by purchasing different grip modules, slides, and barrels without an FFL transfer for those parts.
Any recommended upgrades from your experience?
Our staff frequently notes this model pairs well with an extended slide release for faster, more positive reloads. The modular design also makes adding a custom grip module or a weapon light straightforward.
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