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The P320 has earned a serious reputation over the past decade, and for good reason. The full-size variant gives you the longest barrel and grip combination in the lineup, which translates to a longer sight radius, more muzzle weight to help tame recoil, and a full hand grip that makes a real difference during extended range sessions or in a home defense scenario. The 4.7" carbon steel barrel is finished with a DLC (Diamond-Like Carbon) coating for added durability and wear resistance, and the slide wears SIG's Nitron finish to fend off corrosion.
This specific configuration ships with the PRO optic footprint cut right into the slide, which is compatible with the SIG Romeo1 Pro and other optics sharing that footprint. That means no adapter plates, no messy cuts after the fact. The SIGLite night sights are already installed and co-witness properly, so the pistol is fully functional from the moment it leaves the box whether or not you choose to run a red dot. The full-length 1913 Picatinny accessory rail up front gives you a mounting point for lights and lasers without any additional hardware.
The P320 is built around a removable fire control unit, which is technically the serialized firearm. That means the grip module, slide, and barrel can all be swapped independently, giving you a platform that can grow and change as your needs do. The medium full-size grip module fits a wide range of hand sizes well, and SIG offers alternative grip modules if you want to dial in the fit even further. Field stripping is tool-free and does not require a trigger pull to disassemble, which is a practical and appreciated design choice. The trigger itself is striker-fired with a curved shoe and a crisp break that has consistently been one of the highlights people mention after spending time with this pistol.
Two 17-round steel magazines are included, giving you 35 rounds ready to load before you ever buy a spare. At 28.3 oz loaded, it sits in a comfortable range on the belt without feeling overly heavy.
The PRO footprint on this P320 is designed to work with optics like the SIG Romeo1 Pro and the Leupold DeltaPoint Pro, which share the same mounting pattern. Many popular micro red dots from other manufacturers also offer adapter plates for this footprint. Since the slide comes pre-cut from the factory, no additional milling is needed.
No, this model does not include a manual thumb safety. The P320 Full Size relies on an internal striker safety and a disconnect safety built into the fire control unit. SIG does offer manual safety grip modules as a separate purchase if that is a feature you prefer.
The serialized component on the P320 is the fire control unit (FCU), not the frame or slide. This modular design means you can legally swap grip modules, slides, and barrels around the same FCU. For the end user, it means one pistol can serve multiple roles, and upgrading or changing the platform down the road is straightforward.
SIGLite sights use tritium inserts that produce a visible glow in low-light and no-light conditions without batteries or activation. They are factory installed on both the front and rear of this model. Even after you mount a red dot optic, the night sights can serve as a backup sighting system.
The full-size format gives you a longer grip for a more secure hold under stress, a longer sight radius for better accuracy, and a 17+1 capacity that leaves little to be desired. The included SIGLite night sights are particularly practical for home defense given that low-light situations are common. It is a well-rounded platform that handles duty, range, and defensive roles without compromise.
Yes, that is one of the core advantages of the P320 design. SIG and a number of aftermarket companies offer grip modules in different sizes and textures that drop onto the same FCU. This version ships with the medium full-size module, which fits a wide range of hand sizes comfortably, but going up or down in size is a straightforward swap.
| UPC | 798681697458 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 320F-9-BSSP |
| Action | |
| ATF Type | Pistol |
| Barrel Length | 4.7'' |
| Caliber/Gauge | 9mm |
| Capacity | 17+1 |
| Color | Black |
| Length | 8'' |
| Magazine Included | 2 x 17-Round |
| Model | |
| Number of Magazines | 2 |
| Package Height | 3.0 |
| Package Width | 10.0 |
| Product Type | Striker Fired |
| Safety | No |
| Shipping Weight | 3.4 |
| Sights | Siglite Night Sights |
| Sights Type | Night Sights |
| Slide Description | Optic Ready/Serrated |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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