SIG Sauer · Semi-automatic pistol
SIG Sauer P320 Value
The SIG P320 is a striker-fired, modular semi-automatic pistol built around a removable fire-control unit that serves as the pistol's serialized component, allowing frame size and caliber modules to be changed. It was selected to replace the M9 in U.S. military service as the M17 and M18.
- Type
- Semi-automatic pistol
- Production
- Introduced in the mid-2010s and later adopted by the U.S. military as the M17 and M18
- Maker
- SIG Sauer
About the SIG Sauer P320
The SIG P320 is a striker-fired, modular semi-automatic pistol built around a removable fire-control unit that serves as the pistol's serialized component, allowing frame size and caliber modules to be changed. It was selected to replace the M9 in U.S. military service as the M17 and M18.
The P320 platform spans full-size, compact, subcompact, and X-series competition-oriented configurations, with numerous slide lengths, grip modules, and optic-cut options available across its production history.
Because the pistol's serialized part is the internal fire-control unit rather than the outer frame, buyers evaluating a P320 pay attention to which grip module and slide are paired with a given fire-control unit and whether they are factory-matched.
Variations
SIG Sauer P320 variations that matter
Configuration is often the difference between two otherwise identical examples.
P320 Full-Size and Compact
Standard duty and carry configurations differing in grip length and slide length.
P320 M17/M18
Military-configuration commercial versions replicating the U.S. Army and Marine Corps issued pistols, including coyote tan finish.
P320 X-Series
Competition and enthusiast-oriented configurations with flared magwells, upgraded triggers, and optic-ready slides.
P320 Subcompact
A smaller-frame configuration intended for concealed carry.
Valuation
What affects SIG Sauer P320 value
We do not publish a price chart. These are the characteristics that determine what a specific example evaluates at.
Factor 1
Fire-control unit and module pairing
Because the serialized fire-control unit can be moved between grip modules and slides, whether the components offered together are a factory-matched set affects how a buyer evaluates the pistol.
Factor 2
Optic cut and included plates
Slides machined for red dot optics, along with any included mounting plates, are a feature buyers assess separately from non-optic-cut slides.
Factor 3
Military-pattern configuration
M17/M18-pattern commercial pistols are evaluated for how closely they match the issued military configuration, including finish and controls.
Factor 4
Caliber and frame size
9mm, .40 S&W, and .45 ACP versions across full-size, compact, and subcompact frames are assessed within their own category.
Factor 5
Aftermarket parts
Replacement triggers, sights, or grip modules affect how original the pistol is relative to factory configuration.
Factor 6
Included magazines and case
Factory magazines, box, and any included optic plates contribute to completeness.
SIG Sauer P320: common questions
Other SIG Sauer models
Related to the SIG Sauer P320
Manufacturers
Firearms we buy
Selling a SIG Sauer P320?
Send the details and photographs and we will evaluate the example you actually own.